[clang] Fix clang-format-test.el past 625841c (PR #106398)

[Owen Pan via cfe-commits]

owenca wrote:

@dklimkin I known this is a trivial fix, but it would be better to request anyone from https://github.com/orgs/llvm/teams/pr-subscribers-clang-format to have a look before merging it.

There was an outstanding PR #106305 before yours. Can you review it and see if you want to ask the author to close it?

https://github.com/llvm/llvm-project/pull/106398