Fix edit project service cancel button position

What does this MR do?

Fixes the alignment of the cancel button on the project service settings page.

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

I think it's good to go.

Why was this MR needed?

The cancel button is currently misaligned in the project service settings UI.

Screenshots

Broken

Fixed

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/35555