Fix extraneous whitespace addition in line comments on clang-format directives

Fixes https://github.com/llvm/llvm-project/issues/53844.
I believe this regression was caused by not accounting for clang-format directives in https://reviews.llvm.org/D92257.

Reviewed By: HazardyKnusperkeks, curdeius

Differential Revision: https://reviews.llvm.org/D120188