Improve Night Light suggestion criterion

Night Light suggestion will now show even if the user is using Night
Light in manual mode. If the user has previously tapped or dismissed the
suggestion, the suggestion will not show again.

Bug: 68938869
Test: make ROBOTEST_FILTER=\
"(NightDisplayPreferenceControllerTest|SuggestionFeatureProviderImplTest)" \
RunSettingsRoboTests

Change-Id: Iea838df043d75dfa73a1a383275dc42956374113