Resolve "Branch index delete button inconsistently spaced and misaligned"

What does this MR do?

Fixes whitespace layout issues in the branch index page buttons.
https://gitlab.com/gitlab-org/gitlab-ce/branches

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

Screenshots (if relevant)

Before:

Margins:

After:

Does this MR meet the acceptance criteria?

• [-] Changelog entry added
• [-] Documentation created/updated
• [-] API support added
• Tests
  • [-] Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #24895 (closed)