Transition to clear state after gesture cancelation.

Under some circumstances, remaining in gesture detecting state after gesture cancelation can render TouchExplorer unresponsive to touch input. The clear state is unresponsive to everything but ACTION_DOWN.
Bug: 171421786
Test: atest GestureManifoldTest TouchExplorerTest AccessibilityGestureDetectorTest FrameworksServicesTests:TouchExplorerTest
Change-Id: I9516d3613e92baf16186c24a269866a4143cafc3

Change-Id: I42780f5c733f20b99cb95952d9035109e57750cd