Make sure to reset isFoldHandled

A previous commit reset this flag in select circumstances. However,
there are other paths that also need to be covered. Always reset
isFoldHandled every single time the device has been folded and the
screen has turned on. This should fully prevent errant calls to
showAodUI(), which forces keyguard to show over any other screen.

Paths that could've produced the issue involve:
1. Unfold and unlock
2. Fold the device, it should go to AOD
3. Cover the prox sensor (as if putting in purse/pocket) and let
screen timeout until black.
4. Wait a few moments to let the device really sleep
5. Uncover sensor and unlock with Side FPS immediately

Test: atest FoldAodAnimationsControllerTest
Fixes: 273681779
Change-Id: I3260125fa545494c28e52ecf02825704ffbad295