Some project settings buttons don't have a focus outline

[MMK21Hub]

Describe the bug

When using Firefox, a few of the buttons on the project settings page don't have Modrinth's custom purple or green outline when focused, and use the default browser focus style instead. This is most apparent on the "Save changes" button at the bottom of the page.

This behaviour is inconsistent with other buttons on the page and elsewhere on the site. It is also an accessibility issue, as the default focus outline can be difficult to see.

Here are the buttons that are affected by this bug:

• Save changes (All tabs)
• Upload icon (General) (Note: can't be focused due to Upload buttons cannot be accessed with the keyboard #1694)
• Delete project (General)

Steps to reproduce

Please use Firefox to reproduce this issue.

1. Go to the settings of a project
2. Make a change to one of the settings (to enable the "Save changes" button)
3. Press the Tab key until the "Save changes" button is focused

Expected behavior

The focus style would match the style seen on (for example) the "Remove icon" button in the General tab.

Notes

This issue is reproducible in Firefox, but not Brave browser. I have not tested any others.

[w26ad]

Can't reproduce, 'Save changes' and 'Delete project' have a purple outline now

[MMK21Hub]

Upon further testing, it seems like this bug is only reproducible in Firefox. I have updated the issue description to reflect this.