[clang-tools-extra] [clang-tidy] Fix crash in modernize-use-designated-initializers check (PR #113688)

[Remi Mommsen via cfe-commits]

mommsen wrote:

Will this fix be added to an upcoming patch release for 19.1? We suffer from this issue using version 19.1.5.

https://github.com/llvm/llvm-project/pull/113688