Refactor {Communal|LowLight|Dream}SettingsRepositories to use UserAwareSecureSettingsRepository

The {Communal|LowLight|Dream}SettingsRepositories all follow the pattern of receiving the active user as param for any method that reads from settings by having the respective interactor use userInteractor.selectedUserInfo.

We have UserAwareSecureSettingsRepository for exactly that purpose, so we can use it in these classes instead.

Fixes: 416696502

Test: atest DreamSettingsRepositoryImplTest
Test: atest LowLightBehaviorCoreStartableTest
Test: atest CommunalSettingsRepositoryImplTest
Flag: EXEMPT refactor
Change-Id: I2af28190bb5d00c4b5c67c3b6a2212f460cc0d18