Fix bug where double swipe gets us stuck in Hint state while in Overview.

With the second swipe, we never complete the swipe to Overview

NoButtonNavbarToOverviewTouchController#maybeSwipeInteractionToOverviewComplete
- mReachedOverview = true
- mDetector.isSettlingState = false

And then the second swipe starts the state transition to Hint but then
it never gets completed because:
1. The animation starts
2. Gets cancelled
3. Starts again
4. Finishes, but is not marked as success since the cancel in #2 was never
   set back to false

Bug: 160759508
Change-Id: I8c3972e6209c3d5a4a0bdd9f9b7683de18105d57