[clang-tools-extra] [clang-tidy] NFCI: remove non-functional matcher from SizeofExpressionCheck (PR #142654)

[Carlos Galvez via cfe-commits]

https://github.com/carlosgalvezp approved this pull request.

LGTM, if all tests pass then this must be dead code! Thanks for cleaning up.

https://github.com/llvm/llvm-project/pull/142654