Remove objective error observer

Objective error observer causes errors on reasoner, so it's removed

Author: marioney

launch/includes/laser_filters.launch

@@ -7,6 +7,8 @@
     <rosparam command="load" file="$(find metacontrol_sim)/yaml/laser_filter_config.yaml" />
     <remap from="scan" to="/front/scan" />
   </node>
+  <!-- 
   <node pkg="metacontrol_sim" type="objective_error_publisher.py" name="objective_error_publisher_node" output="screen">
-  </node> 
+  </node>
+  -->
 </launch>

yaml/observers.yaml

@@ -2,5 +2,3 @@ safety:
   name: 'SafetyQualityObserver'
 energy:
   name: 'EnergyQualityObserver'
-error:
-  name: 'ObjetiveErrorObserver'