fix the problem config_list_from_dotenv() can't correctly get other p… (microsoft#2172)

* fix the problem config_list_from_dotenv() can't correctly get other params

* Update openai_utils.py

---------

Co-authored-by: Aaron <[email protected]>
Co-authored-by: Chi Wang <[email protected]>

Author: 3 people

autogen/oai/openai_utils.py

@@ -541,11 +541,11 @@ def get_config(
     """
     config = {"api_key": api_key}
     if base_url:
-        config["base_url"] = base_url
+        config["base_url"] = os.getenv(base_url, default=base_url)
     if api_type:
-        config["api_type"] = api_type
+        config["api_type"] = os.getenv(api_type, default=api_type)
     if api_version:
-        config["api_version"] = api_version
+        config["api_version"] = os.getenv(api_version, default=api_version)
     return config