[Settings] Revert the test for using mPhoneStateListener since the Robolectric test is broken

Bug: 183066948
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=AirplaneModeEnablerTest
Change-Id: Ic5c67a9a2996f40fcb07d0840f5c677494e1dc0a
2 files changed