Update horizontal spacing on runner platform options

What does this MR do and why?

• Update spacing between runner platform options

Update the horizontal spacing between the platf... (#409961 - closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

http://localhost:3000/gitlab-org/gitlab-test/-/runners/new

UX Paper Cuts 16.4 → Pipelines and Jobs (#408231 - closed)