Check that PowerManager#isInteractive is false before showing the AOD UI for screen off.

The callback that runs after a delay during the screen off animation to
show the AOD UI after the light reveal animation is supposed to be
cancelled in onStartedWakingUp if the screen off is cancelled. However,
some bugs make it seem like this may not be happening, resulting in the
AOD UI being shown while we are awake and unlocked. This causes the
shade to look like the lock screen. It also causes a transparent shade
background and possibly an all-white screen.

While we have not been able to reproduce this under normal conditions, I
manually called showAodUi while unlocked/awake, and verified that these
conditions result. Since onStartedWakingUp is dispatched asynchronously,
it's possible that the device wakes up before the callback is cancelled.
By checking PowerManager's state directly, we can avoid this.

Fixes: 213794749
Test: atest SystemUITests
Change-Id: I7e2d1ca7e3c9487903f74fb06575cc0a36b9502c

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