[annotation] Consume event when drag end to prevent click event

I wrote a seperate PR for this issue such as to simplify the review of #1125.
- Fixes #883

Any review and comment would be much appreciated 👍 @LukasPaczos and @langsmith.

Author: Ph0tonic

plugin-annotation/src/main/java/com/mapbox/mapboxsdk/plugins/annotation/DraggableAnnotationController.java

@@ -50,9 +50,10 @@ public DraggableAnnotationController(MapView mapView, MapboxMap mapboxMap,
     mapView.setOnTouchListener(new View.OnTouchListener() {
       @Override
       public boolean onTouch(View v, MotionEvent event) {
+        Annotation oldAnnotation = draggedAnnotation;
         androidGesturesManager.onTouchEvent(event);
-        // if drag is started, don't pass motion events further
-        return draggedAnnotation != null;
+        // if drag is started or drag is finished, don't pass motion events further
+        return draggedAnnotation != null || oldAnnotation != draggedAnnotation;
       }
     });
   }