fix: fix a bug when use_radar_tracking_fusion is fault

Signed-off-by: Taekjin LEE <[email protected]>

launch/tier4_perception_launch/launch/object_recognition/detection/merger/camera_lidar_radar_merger.launch.xml

@@ -28,7 +28,6 @@
   <arg name="input/radar_far/objects" default="radar/noise_filtered_objects"/>
   <arg name="input/detection_by_tracker/objects" default="detection_by_tracker/objects"/>
   <arg name="output/objects" default="objects"/>
-  <let name="output/objects" value="near_objects" unless="$(var use_radar_tracking_fusion)"/>
 
   <!-- internal interfaces -->
   <let name="radar_objects_fusion/input/objects" value="$(var input/lidar_ml/objects)"/>