[clang-tools-extra] [clang-tidy] Fix false positive in modernize-make-unique (PR #229802)

[Daniil Dudkin via cfe-commits]

https://github.com/unterumarmung approved this pull request.

LGTM but I'm not sure my approve is enough. 

Also, can we add the `friend` test case from previous my comment as a regression test?

https://github.com/llvm/llvm-project/pull/229802