branch_picker: Ensure create buttons have unique IDs (#54117)

Little bug I noticed that was preventing the buttons in the branch
picker's footer from working correctly.

Release Notes:

- Fixed a bug in the branch picker where the buttons wouldn't properly
get activated.
56370bb5f8Danilo Leal committed on 4/16/2026, 8:33:59 PM· committed by GitHubparentdbb057b
1 file changedLine totals unavailable