Fix App Handle animation on cancelled drags

Ensures that the pressed state of the app handle is reset manually when
finishing a drag gesture. On drag-to-cancel cases, the App Handle
remains visible and needs to be set to unpressed manually because the
custom touch handler will consume the event (primarily to prevent
clicks).

Flag: EXEMPT bugfix
Fix: 367346098
Test: drag from app handle and release back in the fullscreen region,
verify the handle animated back to its full scale.

Change-Id: I94f15e024b630ce0e4d5b74203259925cd348178