`conversation-filters` shows the wrong "current filter" checkbox #4589

Please ensure:

• The bug is caused by Refined GitHub. It doesn't happen if I disable the extension.

Describe the problem and how to replicate it

"Everything mentioning you" is cloned as a whole and the checkbox is preserved, but it shouldn't be

Screenshots/video/gif showing the issue, if it’s visual

<img width="345" alt="Screen Shot" src="https://user-images.githubusercontent.com/1402241/126269218-3bb1ec09-4d5b-4fe4-885a-dbdc23134aa3.png">

Console errors, if any

No response

Example URL

// https://github.com/sindresorhus/refined-github/issues?q=is%3Aopen+mentions%3A%40me

Browser(s) used

safari