[clang-tools-extra] [clang-tidy] fix incorrect hint for InitListExpr in prefer-member-initializer (PR #81560)

[Julian Schmidt via cfe-commits]

https://github.com/5chmidti commented:

FYI: I have found a false-negative that is unrelated to this pr and issue, but my fix builds upon your pr. I filed an issue for it here #81613 and will post a pr once yours in merged, I don't want to make a stack just for that fix.

https://github.com/llvm/llvm-project/pull/81560