Fix deleting protected branch

What does this MR do and why?

Prevents from deleting protected branch when submit button is disbaled.

Screenshots or screen recordings

Screenshot_2022-11-16_at_15.44.30

How to set up and validate locally

  1. Go to Repository > Branches within a project
  2. Click on delete icon for protected branch
  3. Try hitting enter when delete button in confirm modal is disabled

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #366301 (closed)

Merge request reports

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