Make ListingController always listening

The controller will always be listening after it's constructed (except
while switching users). In this way, GlobalActionsDialog does not have
to wait to get updated information about available services.

Also, fixed a small multi user switching issue in CLC.

Fixes: 150956595
Test: atest
Test: manual after reboot
Change-Id: I5aee79a537d577f2fca027495dfce2e426e48ef6

• packages/SystemUI/src/com/android/systemui/controls/management/ControlsListingControllerImpl.kt[diff]
• packages/SystemUI/tests/src/com/android/systemui/controls/management/ControlsListingControllerImplTest.kt[diff]