Tweak actions view sticky (#29781)
Add some space when the left side items are sticky due to scrolling the
right side.
<img width="419" alt="image"
src="https://github.com/go-gitea/gitea/assets/115237/292e1b03-a071-4744-bb79-e50d109056c8">
(cherry picked from commit eb8c34fc367f324226625d39d0487f945269cd73)
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