chore(perception): change namespace of traffic light nodes (#342)

Signed-off-by: Tomohito Ando <[email protected]>

autoware_launch/launch/components/tier4_perception_component.launch.xml

@@ -28,6 +28,7 @@
     <arg name="centerpoint_model_name" value="aip_x2"/>
     <arg name="centerpoint_model_path" value="$(var centerpoint_model_path)"/>
     <arg name="centerpoint_model_param_path" value="$(var centerpoint_model_param_path)"/>
+    <arg name="namespace1" value="camera7"/>
 
     <!-- object recognition -->
     <arg