[libc++][test] concat_macros.h: Fix TEST_HAS_NO_WIDE_CHARACTERS syntax damage#74987

mordante merged 1 commit intollvm:mainllvm/llvm-project:mainfrom

StephanTLavavej:stl-29-fix-concat_macrosStephanTLavavej/llvm-project:stl-29-fix-concat_macrosCopy head branch name to clipboard