fix: perception launcher syntax error

perception_launch/launch/obstacle_segmentation/ground_segmentation/ground_segmentation.launch.py

@@ -265,7 +265,7 @@ def create_single_frame_obstacle_segmentation_components(self, input_topic, outp
             components.append(
                 self.get_additional_lidars_concatenated_component(
                     input_topics=[common_pipeline_output]
-                    + list(map(lambda x: f"{x}/pointcloud"), additional_lidars),
+                    + list(map(lambda x: f"{x}/pointcloud", additional_lidars)),
                     output_topic=relay_topic if use_ransac else output_topic,
                 )
             )