When the pairing dialog doesn't show in the foreground at the first time, the pairing key will display incorrectly.
This is caused by the intent doesn't contain the parameter BluetoothDevice.EXTRA_PAIRING_KEY.
Correct the pairing key by passing the pairing key to intent pairingDialogIntent.
Tag: #stability
Bug: 188614067
Test: make RunSettingsRoboTests ROBOTEST_FILTER=BluetoothPairingServiceTest
Change-Id: I3c91bf6ea51fa3fb77b4c4a5c17555606160603e
c491216243