[clang-tools-extra] [clang-tidy] Fix readability-trailing-comma false positive on #endif (PR #219634)

[Aayush Mainali via cfe-commits]

AayushMainali-Github wrote:

> > ⚠️ We detected that you are using a GitHub private e-mail address to contribute to the repo. Please turn off [Keep my email addresses private](https://github.com/settings/emails) setting in your account. See [LLVM Developer Policy](https://llvm.org/docs/DeveloperPolicy.html#email-addresses) and [LLVM Discourse](https://discourse.llvm.org/t/hidden-emails-on-github-should-we-do-something-about-it) for more information.
> 
> Also please make your email public.

Did!

https://github.com/llvm/llvm-project/pull/219634