Don't call updateIsKeyguard from the UnlockedScreenOffAnimationController if...

Don't call updateIsKeyguard from the UnlockedScreenOffAnimationController if we can't control the screen off animation.

This call is intended to ensure the keyguard is in the correct state if the screen off animation is interrupted. It should be very safe to not call this if the screen off animation was not able to play at all.

See b/192323808 for detailed investigation.

Fixes: 192323808
Test: Disable AOD (thus disabling screen off), press the power off button to begin turning off the screen, then double tap to launch camera as the screen is turning off (I can repro ~10% of the time)
Change-Id: I57597308fdc3b5cb86b2c755f33f82d1476c2c09