Set occluded state on remote animation cancel.

The launch animator cancel method can be
called by other methods within the activity
launch animator, which is very dangerous
since it can set the occluded state incorrectly.

Bug: 235463625
Test: occlude and unocclude repeatedly to trigger cancel/restart
Change-Id: I1a8cc95876c2966009c9cfa8dbe2471a360930a7