Add spacing between approval checkbox and textarea

What does this MR do and why?

• Fix alignment of Approve checkbox on summary comment dropdown

Screenshots or screen recordings

Before	After

How to set up and validate locally

• Go to MR
• Start a review
• Click Finish review

MR submit review: editor border is too close to... (#419344 - closed)

UX Paper Cuts 16.3 → Settings UI, part 2 (#417912 - closed)