[clang-tidy] Fix readability-simplify-boolean-expr when Ifs have an init...

[clang-tidy] Fix readability-simplify-boolean-expr when Ifs have an init statement or condition variable

Fixes https://github.com/llvm/llvm-project/issues/55553.

Reviewed By: LegalizeAdulthood

Differential Revision: https://reviews.llvm.org/D125874