[#386] Resolve "Launch file for ray_ground_classifier_nodes does not work"

Description

• fix #386 (closed)

Notes for Reviewer

I have confirmed that the procedure below works by referring to the Running the Autoware.Auto 3D perception stack.

ade$ rviz2 -d /home/"${USER}"/AutowareAuto/install/autoware_auto_examples/share/autoware_auto_examples/rviz2/autoware.rviz
ade$ udpreplay ~/data/route_small_loop_rw-127.0.0.1.pcap
ade$ ros2 launch ray_ground_classifier_nodes vlp16_lexus.launch.py

Checklist

• fix launch file