[clang-tidy] fix PR39583 - ignoring ParenCast for string-literals in...

[clang-tidy] fix PR39583 - ignoring ParenCast for string-literals in pro-bounds-array-to-pointer-decay

Summary:
The fix to the issue that `const char* p = ("foo")` is diagnosed as decay
is to ignored the ParenCast.
Resolves PR39583

Reviewers: aaron.ballman, alexfh, hokein

Reviewed By: aaron.ballman

Subscribers: nemanjai, xazax.hun, kbarton, cfe-commits

Differential Revision: https://reviews.llvm.org/D54281

llvm-svn: 346555