chore(tier4_perception_launch): disable internal traffic light signals (

autowarefoundation#746)

Signed-off-by: Makoto Kurihara <mkuri8m@gmail.com>

launch/tier4_perception_launch/launch/traffic_light_recognition/traffic_light.launch.xml

@@ -8,7 +8,7 @@
   <arg name="classifier_label_path" default="$(find-pkg-share traffic_light_classifier)/data/lamp_labels.txt" description="classifier label path"/>
   <arg name="classifier_model_path" default="$(find-pkg-share traffic_light_classifier)/data/traffic_light_classifier_mobilenetv2_batch_6.onnx" description="classifier onnx model path"/>
   <arg name="input/cloud" default="/sensing/lidar/top/pointcloud_raw" description="point cloud for occlusion prediction"/>
-  <arg name="internal/traffic_signals" default="/perception/traffic_light_recognition/internal/traffic_signals"/>
+  <arg name="internal/traffic_signals" default="/dummy/perception/traffic_light_recognition/internal/traffic_signals"/>
   <arg name="external/traffic_signals" default="/perception/traffic_light_recognition/external/traffic_signals"/>
   <arg name="output/traffic_signals" default="/perception/traffic_light_recognition/traffic_signals"/>
   <arg name="use_crosswalk_traffic_light_estimator" default="true" description="output pedestrian's traffic light signals"/>