Move "Turn on phone calls" from guest detail user screen to user screen.
Optimisation: Applying restrictions to default guest user has been moved
to UserManagerService -> setDefaultGuestRestrictions.
Following UX there is no need for confirmation dialog.
Bug: 191483069
Test: make RunSettingsRoboTests -j128 ROBOTEST_FILTER="com.android.settings.users.GuestTelephonyPreferenceControllerTest"
make RunSettingsRoboTests -j128 ROBOTEST_FILTER="com.android.settings.users.UserSettingsTest"
Change-Id: Id7391d3f85954ea7f9c94791f24174105ec8073e