fix Add issues button height

What does this MR do?

Add wrapper div around button (same as EE). Prevents button from stretching

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

Should this go in 9.5? It has been around for a while.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

Closes #36437 (closed)