fix(tier4_perception_launch): launch namespace of `detection_by_track…

…er` (autowarefoundation#8702)

fix: namespace of detection_by_tracker do not need to have the prefix `autoware_`

Signed-off-by: Taekjin LEE <taekjin.lee@tier4.jp>

launch/tier4_perception_launch/launch/object_recognition/detection/detector/tracker_based_detector.launch.xml

@@ -3,7 +3,7 @@
   <arg name="output/objects"/>
   <!-- DetectionByTracker -->
   <group>
-    <push-ros-namespace namespace="autoware_detection_by_tracker"/>
+    <push-ros-namespace namespace="detection_by_tracker"/>
     <include file="$(find-pkg-share autoware_detection_by_tracker)/launch/detection_by_tracker.launch.xml">
       <arg name="detection_by_tracker_param_path" value="$(var object_recognition_detection_detection_by_tracker_param)"/>
       <arg name="output" value="$(var output/objects)"/>