Change LightningCLI tests to account for future fix in jsonargparse

[mauvilsa]

What does this PR do?

It didn't make sense that in configs parameters with class type have the class_path and init_args structure, but callables that return a class instance don't. This will be fixed in the next release of jsonargparse. This pull request changes a couple of LightningCLI unit tests so that once the new jsonargparse release comes out, the lightning tests don't start failing.

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📚 Documentation preview 📚: https://pytorch-lightning--20372.org.readthedocs.build/en/20372/

[lantiga]

Thank you!