Avoid sticky header overlap when linking to comments

Description

This:

I'm not sure if it's just an issue with PR review comments, I can't repro elsewhere.

The fix is simple though, it just needs testing in other parts of the site and a more specific selector

[id] {
  scroll-margin-top: 80px;
}

The code will go in github-bugs.css

Example URLs

https://github.com/refined-github/sandbox/pull/47#discussion_r979366510