message: remove add child renderer in observer model none
diff: @@ -48,9 +48,6 @@ class ObserverModelNone : public ObserverModel {
  // NOTE: this creates a standard observed world
  ObservedWorld observed_world(world, agent_id);
  // NOTE: generate child renderer for the observed world
  - RendererPtr renderer = world->GetRenderer()->AddRendererChild(
  - std::to_string(agent_id));
  - observed_world.SetRenderer(renderer);
  return observed_world;
  }
  