Listen to DisplayStateInteractor for LowLightMonitor display changes.

This change switches to DisplayStateInteractor for default display
on/off state, which handles the case where the screen is turned off due
to proximity.

Fixes: 402352708
Flag: EXEMPT bugfix
Test: atest LowLightMonitorTest
Change-Id: Ie6b4dd453a6a62f573c08eabf708a5db4a506b5a