Close Wi-Fi Calling screen if provisioning status changes to disallow

Starts to listen for provisioning changes in Wi-Fi Calling screen and
closes the screen if the Wi-Fi Calling provisioning status changes to
disallow.

This prevents the Wi-Fi Calling screen from being kept open if the Wi-Fi
Calling provisioning status is changed to disallow while the Wi-Fi
Calling screen is open.

Bug: 119389855
Test: make RunSettingsRoboTests \
ROBOTEST_FILTER=WifiCallingSettingsForSubTest
Change-Id: I2af91c3734274f0aea942a8bb894d6f4ce295354