[fix] not using the correct xacro tag for gz_ros2_control

[alec-03]

Problem

Launching any kortex description gazebo sim with a prefix will NOT spawn the gazebo controller_manager with the prefix

The Error

This line uses the non-existent tag <controller_manager_node_name>

ros2_kortex/kortex_description/robots/kinova.urdf.xacro

Line 81 in 6a9960e

<controller_manager_node_name>$(arg prefix)controller_manager</controller_manager_node_name>

see: https://github.com/ros-controls/gz_ros2_control/blob/rolling/doc/index.rst

The Fix

changing this tag to <controller_manager_name> will cause the prefix to be prepended correctly

[alec-03]

Noting here that the kortex_bringup/launch/kortex_sim_control.launch.py file would need to have lines like this changed to include the prefix (ros2_controllers.yaml needs to be updated as well)

ros2_kortex/kortex_bringup/launch/kortex_sim_control.launch.py

Line 168 in 6a9960e

arguments=[robot_hand_controller, "-c", "/controller_manager"],