Fix branches page dropdown sort alignment

What does this MR do?

Makes the dropdown sort top aligned with the other elements beside it

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

Shouldn't be

Why was this MR needed?

Improves the UI

What are the relevant issue numbers?

Closes #20837 (closed)

Screenshots (if relevant)

Before:

After:

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Tests
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together