fusion_only true (autowarefoundation#835)

Signed-off-by: Yuxuan Liu <uken.ryu.2@tier4.jp>
Co-authored-by: Yuxuan Liu <uken.ryu.2@tier4.jp>

autoware_launch/launch/components/tier4_perception_component.launch.xml

@@ -166,7 +166,7 @@
     <!-- traffic light recognition -->
     <arg name="use_traffic_light_recognition" value="true"/>
     <arg name="traffic_light_recognition/enable_fine_detection" value="$(var traffic_light_recognition/enable_fine_detection)"/>
-    <arg name="traffic_light_recognition/fusion_only" value="false"/>
+    <arg name="traffic_light_recognition/fusion_only" value="true"/>
     <arg name="traffic_light_image_number" value="1"/>
 
     <arg name="traffic_light_arbiter_param_path" value="$(find-pkg-share autoware_launch)/config/perception/traffic_light_arbiter/traffic_light_arbiter.param.yaml"/>