In WiFi calling settings, although each WifiCallingSettingsForSub instance has its mSubId, the mPhoneStateListener always listens to state of default subId, which is incorrect. This is to fix that. Bug: 109787945 Test: In DSDS device, open WFC settings. Make phone call using default voice phone, and check that WFC setting tab of the other phone is not greyed out. Change-Id: I126047c6099bf156b40e0145aa55df0fdf8ef882