Fix approvals responsive wrapping on mobile

What does this MR do?

Fix approvals responsive wrapping on mobile

Before	After

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

The "Remove your approval" button would escape outside of MR widget box.

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• If paid feature, have we considered GitLab.com plan and how it works for groups and is there a design for promoting it to users who aren't on the correct plan

What are the relevant issue numbers?

Closes #3333 (closed)