feat(tier4_simulator_launch): convert /diagnostics_err (#3152)

Signed-off-by: Takayuki Murooka <takayuki5168@gmail.com>

Author: takayuki5168

launch/tier4_simulator_launch/launch/simulator.launch.xml

@@ -109,7 +109,7 @@
   <!-- Diagnostic Converter -->
   <group if="$(var launch_diagnostic_converter)">
     <node name="diagnostic_converter" exec="diagnostic_converter" pkg="diagnostic_converter" output="screen">
-      <param name="diagnostic_topics" value="[/diagnostic/planning_evaluator/metrics]"/>
+      <param name="diagnostic_topics" value="[/diagnostic/planning_evaluator/metrics, /diagnostics_err]"/>
     </node>
   </group>