Change default topic name for display contacts (#2561)

moveit_ros/planning/planning_response_adapter_plugins/res/default_response_adapter_params.yaml

@@ -24,5 +24,5 @@ default_response_adapter_parameters:
   display_contacts_topic: {
     type: string,
     description: "If contacts are found in the solution path, they can be published as markers to this topic (visualization_msgs::MarkerArray). An empty string disables the publisher.",
-    default_value: "display_planned_path",
+    default_value: "display_contacts",
   }