Only call super.updateState when work profile exists

Since the updateState() method is being called regardless of the availability of a work profile, we were trying to get settings for USER_NULL, which was leading to crashes.

Flag: com.android.server.notification.polite_notifications
Fixes: 402317471
Test: manual with existing work profile & without existing work profile
Change-Id: Icddabd9a7575713f42a0f5bd955b65a7e46c7f45