Fix incorrect state transitions

The illumination dot and HBM would sometimes stay after enrollment or
authentication. This was because the OnTouchListener would pick up
a "fingerDown" event while the dialog was in the process of hiding.

Fixed by removing the listener and forcing the dialog into the
"fingerUp" state when hiding the dialog.

Bug: 162010430
Test: manual on device
Change-Id: Icfc14ce04a6c9ca02538d9ff82caf32d380ee6d1