Abort queued-sleep transition if display shouldn't sleep anymore

If a SLEEP gets queued due to an ongoing transition, there's a chance
that, by the time it is executed, the display won't be sleeping
anymore. In that case, we should abort the sleep.

Bug: 283461350
Test: Use CtsControls and long-press home-controls on lockscreen
Change-Id: I2465e1e98ed459bb7d8a459e175ecf2cbbd16fbc