[clang] [libclang/python] Simplify __eq__ operators (PR #140540)

[Jannick Kremer via cfe-commits]

DeinAlptraum wrote:

@Endilll I don't see the `__ne__` operator being addded in the diff
If you are referring to the "Fix formatting again, again" commit, that just readds the operator after accidentally removing it in the "Fix formatting" commit (I had some issues with my editor yesterday)

https://github.com/llvm/llvm-project/pull/140540