don't call glview.onPause() in stopThread because the GvrView has

already been shut down by then

Author: codeanticode

libraries/cardboard/src/processing/cardboard/PSurfaceCardboard.java

@@ -195,7 +195,6 @@ public void resumeThread() {
 
   @Override
   public boolean stopThread() {
-    glview.onPause();
     running = false;
     return true;
   }