[clang-tools-extra] [clang-tidy] fix cppcoreguidelines-narrowing-conversions false positives when narrowing integer to signed integer in C++20 (PR #116591)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL requested changes to this pull request.

Consider just changing default value of WarnOnIntegerNarrowingConversion option.

https://github.com/llvm/llvm-project/pull/116591