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

This reverts commit a8c08584.

Reason for revert: "caused a regression with quick switch from home: if you start the gesture then swipe back to the left, it ends up launching the task anyway"

Change-Id: I8e12e2de46b6fc6a3faeb0336762da08080c61d6