homescreens/folio: Halve the needed swipe distance for swipe detection

Devin Linrequested to merge
work/devinlin/folioreducegesturearea into master

SwipeArea requires 10px to differentiate between taps and swipes. HomeScreenState uses a further 10px to differentiate between vertical and horizontal swipes. This MR combines the swipe detection together so that we only need 10px rather than 20px for gesture detection.

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