fix vertical alignment of New Project button

What does this MR do?

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12944/diffs#3a262e1127de2eedf195d81146090d46487cc967_303_301

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

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [ ] 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 #35556 (closed)