Mount Process Order Fix 2

Added a check to SceneObject::setProcessTick() to prevent objects that have mounts from being removed from the process list so the processAfter chain of the mounted objects is not broken.

Engine/source/scene/sceneObject.cpp

@@ -945,7 +945,8 @@ void SceneObject::setProcessTick( bool t )
 
    if ( mProcessTick )
    {
-      plUnlink();
+      if ( !getMountedObjectCount() )
+         plUnlink(); // Only unlink if there is nothing mounted to us
       mProcessTick = false;
    }
    else