applets/kickoff: add spacing between non-switch-on-hover category items

Nate Grahamrequested to merge
work/ngraham/gaps-between-kickoff-category-items into master

Otherwise, their highlight effects touch, and it looks bad.

To avoid blowing up the layout as a result of this change, slightly decrease the height of these category list items too, which also reduces some code complexity.

Before After
Before After

BUG: 508985
FIXED-IN: 6.6.0

Edited by Nate Graham

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