MultiFingerMultiTap: reset the expiration clock when fingers go up.

We were resetting the expiration clock every time a finger went down, but were not resetting it when fingers went up. As a result the user had a super narrow window to get all the fingers up before the gesture canceled.
Bug: 156880174
Test: atest GestureManifoldTest
Change-Id: I81dd9cd67729cfae38952d44295c3340c5426028

Change-Id: I1b6323ac413bcbd46fd9292fbb4cf7ebdf2b6246