Update willFinishToHome during follow-up gestures

AbsSwipeUpHandler updates RAC.setWillFinishToHome when the
initial gesture crosses the resume/recents threshold. However,
follow-up gestures don't use AbsSwipeUpHandler -- they go through
RecentsView instead which wasn't updating willFinishToHome. This
confuses RecentsAnimationController.

Bug: 269212678
Test: open app, swipe to overview (let go), swipe down back to fullscreen.
Change-Id: I6cff6856eadf1539ace8a03715491d31920d41e7