Polish bravery panel

[luixxiul]

Closes #5726
Follow-up to #10181

• Remove fixed width; now that we have the compact bravery panel, we would not have to take the possibility into consideration that the panel would cover the UI.
• Increase padding-right from 1.5em to 2em on the dropdown to add 1em space between the option and the down arrow (See Block 3rd Party Fingerprinting option below).
• Decrease the margin-bottom of the dropdown and Increase margin between switches

From:

To:

Here is an extreme example (which would not happen in reality, unless the font rendering is quite poor + screen resolution is very low).

That panel can be scrolled horizontally.

Auditors:

Test Plan:

1. Change lang setting
2. Restart the browser
3. Open Bravery panel on an external site
4. Make sure the strings are not wrapped

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.

Reviewer Checklist:

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header

[luixxiul]

This prevents the strings inside the dropdowns and the labels from wrapping, without forcing the same width for each column.

[cezaraugusto]

++