[clang-tools-extra] [clang-tidy][NFC] Remove hack in readability-implicit-bool-conversion testcases (PR #188399)

[Victor Chernyakin via cfe-commits]

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

Thanks for doing this, in my original PR I just saw the tests fail and gave up ;)

https://github.com/llvm/llvm-project/pull/188399