`download-folder-button` is conflicting with `default-branch-button` #3449

Probably just a broken selector

Default branch ✅

<img width="876" alt="" src="https://user-images.githubusercontent.com/1402241/89771711-aac4f300-daf8-11ea-9b05-8e5d605c2aa6.png">

No-default branch

https://github.com/sindresorhus/refined-github/tree/incremental-tag-changelog-link/media

<img width="874" alt="" src="https://user-images.githubusercontent.com/1402241/89771737-b4e6f180-daf8-11ea-82e0-1659a125c442.png">