Fixes connecting to service after setup finishes for other users

Changed event to connect to launcher service using onUserSetupChanged
instead of onDeviceProvisionedChanged since it does not run when other
users finish setup wizard.

Test: manual - create new user and finish setup, check connection status
Change-Id: I37d55b6089ebddb0bd2ab9e5d0e0bb3fa8d73948
Fixes: 68994491