This fixes an issue where if the device is rotated on the 2nd or further page, the page would not snap immediately back to the right position, but would instead animate.
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.
