android:fix: Sets bluetoothManager state to AppRTCBluetoothManager.State.HEADSET_UNAVAILABLE if user disconnects their headset and there is no new device returned from getScoDevice()

Author: davisk4rpi

android/src/main/java/com/zxcpoiu/incallmanager/AppRTC/AppRTCBluetoothManager.java

@@ -145,6 +145,7 @@ private void updateDeviceList() {
       boolean needChange = false;
       if (bluetoothAudioDevice != null && newBtDevice == null) {
         needChange = true;
+        bluetoothState = State.HEADSET_UNAVAILABLE;
       } else if (bluetoothAudioDevice == null && newBtDevice != null) {
         needChange = true;
       } else if (bluetoothAudioDevice != null && bluetoothAudioDevice.getId() != newBtDevice.getId()) {