[Suggestion] Correction for error when running my_motion_planning.launch

[pedroexenberger]

Hi,
I'm using this repo to run autoware + lgsvl, following the start guide. When running the my_motion_planning.lauch file in the autoware runtime_manager, there was an error: could not find the vehicle_socket.launch. When changing the my_motion_planning.launch from

<!-- Vehicle Contorl -->
  <include file="$(find runtime_manager)/scripts/vehicle_socket.launch"/>

to

<!-- Vehicle Contorl -->
  <include file="$(find runtime_manager)/launch_files/vehicle_socket.launch"/>

the file could be properly found and the car drove correctly.
This file path correction work when considering autoware version 1.12.0. Not sure if it's kept for backwards compatibily, but reporting just in case.