Bluetooth: use TrackRecording handler for callback.

Otherwise the thread is not defined and a SecurityException may be triggered when inserting data into the ContentProvider.
Sadly, below API26 this needs to be done manually.

Fixes #1165.

src/androidTest/java/de/dennisguse/opentracks/services/TrackRecordingServiceTestUtils.java

@@ -27,7 +27,7 @@ public class TrackRecordingServiceTestUtils {
         TrackRecordingService service = ((TrackRecordingService.Binder) mServiceRule.bindService(new Intent(context, TrackRecordingService.class)))
                 .getService();
 
-        service.getTrackPointCreator().setRemoteSensorManager(new BluetoothRemoteSensorManager(context, service.getTrackPointCreator()));
+        service.getTrackPointCreator().setRemoteSensorManager(new BluetoothRemoteSensorManager(context, null, service.getTrackPointCreator()));
         service.getTrackPointCreator().setClock(Clock.systemUTC());
         service.endCurrentTrack();
     }

src/androidTest/java/de/dennisguse/opentracks/services/handlers/TrackPointCreatorTest.java

@@ -32,7 +32,7 @@ public class TrackPointCreatorTest {
     @Before
     public void setUp() {
         subject = new TrackPointCreator(locationHandler, server);
-        subject.start(context);
+        subject.start(context, null);
     }
 
     @After