Do not activate force_mode_controller by default

Since it isn't compatible with streaming controllers, we deactivate it
for now. It can be activated at runtime.

Author: Felix Exner

ur_robot_driver/launch/ur_control.launch.py

@@ -167,13 +167,13 @@ def controller_spawner(controllers, active=True):
         "speed_scaling_state_broadcaster",
         "force_torque_sensor_broadcaster",
         "ur_configuration_controller",
-        "force_mode_controller",
     ]
     controllers_inactive = [
         "scaled_joint_trajectory_controller",
         "joint_trajectory_controller",
         "forward_velocity_controller",
         "forward_position_controller",
+        "force_mode_controller",
     ]
     if activate_joint_controller.perform(context) == "true":
         controllers_active.append(initial_joint_controller.perform(context))