Do not start urscipt_interface when using mock hardware

As the urscript_interface tries to establish a connection to a robot we
should not attempt to start it when use_mock_hardware is set to true.

ur_robot_driver/launch/ur_control.launch.py

@@ -256,6 +256,7 @@ def launch_setup(context, *args, **kwargs):
         executable="urscript_interface",
         parameters=[{"robot_ip": robot_ip}],
         output="screen",
+        condition=UnlessCondition(use_mock_hardware),
     )
 
     controller_stopper_node = Node(