Fix BTHS is still in pairing list after BTHS is connected

This CL uses onProfileConnectionStateChanged() to handle
the case that bonded device is connected in pairing list.

1. Finish BluetoothPairingDetail page if the bonded device is connected
and selected.
2. Remove the devices in BluetoothPairingDetail page if the device is
connected.

Bug: 142519901
Test: make -j42 RunSettingsRoboTests
Change-Id: I51a9f2ebc0b491edb8ea026ff62ec20ae91eee1d