Update conversable_agent.py judgement redundance in func: _summarize_chat

[Siriuslala]

Why are these changes needed?

I found a tiny point which cannot be called an error but could bring confusion when reading the code.
There is redundance in _summarize_chat function in conversable_agent.py: Before judging the type of summary_method, we simply return summary if the summary_method is None. Afterwards we use elif summary_method == "last_msg" or summary_method is None: which is confusing to me because there is no need to judge whether summary_method is None or not.

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[gitguardian]

⚠️ GitGuardian has uncovered 96 secrets following the scan of your pull request.

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🔎 Detected hardcoded secrets in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
12853598	Triggered	Generic High Entropy Secret	79dbb7b	test/oai/test_utils.py	View secret
10404693	Triggered	Generic High Entropy Secret	e43a86c	test/oai/test_utils.py	View secret
10404693	Triggered	Generic High Entropy Secret	bdb40d7	test/oai/test_utils.py	View secret
10404693	Triggered	Generic High Entropy Secret	954ca45	test/oai/test_utils.py	View secret
10404693	Triggered	Generic High Entropy Secret	79dbb7b	test/oai/test_utils.py	View secret
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10404662	Triggered	Generic CLI Secret	0524c77	.github/workflows/dotnet-release.yml	View secret
10404662	Triggered	Generic CLI Secret	d7ea410	.github/workflows/dotnet-release.yml	View secret
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12853599	Triggered	Generic High Entropy Secret	79dbb7b	test/oai/test_utils.py	View secret
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10404695	Triggered	Generic High Entropy Secret	b97b99d	test/oai/test_utils.py	View secret
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10493810	Triggered	Generic Password	501610b	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
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10493810	Triggered	Generic Password	97fa339	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	49e8053	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	d422c63	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	97fa339	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	d422c63	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	97fa339	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	501610b	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10404696	Triggered	Generic High Entropy Secret	954ca45	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	bdb40d7	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	79dbb7b	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	e43a86c	test/oai/test_utils.py	View secret
10422482	Triggered	Generic High Entropy Secret	79dbb7b	test/oai/test_utils.py	View secret
10422482	Triggered	Generic High Entropy Secret	bdb40d7	test/oai/test_utils.py	View secret
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11616921	Triggered	Generic High Entropy Secret	a86d0fd	notebook/agentchat_agentops.ipynb	View secret
11616921	Triggered	Generic High Entropy Secret	394561b	notebook/agentchat_agentops.ipynb	View secret
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12853598	Triggered	Generic High Entropy Secret	2b3a9ae	test/oai/test_utils.py	View secret
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10404693	Triggered	Generic High Entropy Secret	c03558f	test/oai/test_utils.py	View secret
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10493810	Triggered	Generic Password	3b79cc6	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	11baa52	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	11baa52	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10493810	Triggered	Generic Password	3b79cc6	notebook/agentchat_pgvector_RetrieveChat.ipynb	View secret
10404696	Triggered	Generic High Entropy Secret	0a3c6c4	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	76f5f5a	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	c03558f	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	2b3a9ae	test/oai/test_utils.py	View secret
10422482	Triggered	Generic High Entropy Secret	2b3a9ae	test/oai/test_utils.py	View secret
10422482	Triggered	Generic High Entropy Secret	c03558f	test/oai/test_utils.py	View secret

and 16 others.

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