remove LHS system to RHS in lgsvl_interface

Description

As lgsvl-2020.05 fixed the LHS to RHS it is not required in the interface anymore

This implementation is now in lgsvl and not needed in the lgsvl_interface

quaternion.x = - unity_quaternion.z
quaternion.y = unity_quaternion.x
quaternion.z = - unity_quaternion.y
quaternion.w = unity_quaternion.w

Relates to 438, #412 (comment 351432594)

Notes for Reviewer

To test

ros2 launch lgsvl_interface lgsvl.launch.py

Checklist

• Documentation was updated