AOD: Fix rotation during screen off (again)

Fixes another issue where the screen could rotate during the screen-off transition.
mAwake is still true during goingToSleep, but we should no longer play rotation
animations if we are going to sleep. Instead use the more appropriately named
okToAnimate.

Change-Id: I816d1552de3fea0a19ce42ca50d845eb46f80625
Fixes: 63760853
Test: Trigger show-when-locked navigation, rotate phone to landscape, trigger assistant, go to sleep. Verify no rotation plays; go/wm-smoke