[Privacy Chip] Minor updates to StatusBarContentInsetsProviderTest

Updates:
 - A previous CL updated the provider to not care about
`context.display.uniqueId`, so this updates the test to not set that ID
either.
 - Remove `ConfigurationController.onConfigurationChanged` calls, since
   they weren't needed (the provider just uses the context directly)
 - Add additional listener tests

Bug: 212924195
Bug: 245799099
Test: atest StatusBarContentInsetsProviderTest
Change-Id: I8191982299f26c01b2a0c92bdfd8e2f5551c7568