[clang-tools-extra] [clang-tidy] Fix false positives in readability-trailing-comma for designated initializers (PR #215934)

[Baranov Victor via cfe-commits]

vbvictor wrote:

Please don't write verbose description. E.g. I can see from the code what the fix is - don't duplicate it in description.

https://llvm.org/docs/AIToolPolicy.html#details
> To ensure sufficient self review and understanding of the work, it is strongly recommended that contributors write PR descriptions themselves (if needed, using tools for translation or copy-editing).

https://github.com/llvm/llvm-project/pull/215934