Added dynamics tag when using mock_components/GenericSystem (backport of #175)

(cherry picked from commit d55919d)

Co-authored-by: Niccolo <[email protected]>

Author: mergify[bot]

urdf/ur.ros2_control.xacro

@@ -35,6 +35,7 @@
           <plugin>mock_components/GenericSystem</plugin>
           <param name="fake_sensor_commands">${fake_sensor_commands}</param>
           <param name="state_following_offset">0.0</param>
+          <param name="calculate_dynamics">true</param>
         </xacro:if>
         <xacro:unless value="${use_fake_hardware or sim_gazebo or sim_ignition}">
           <plugin>ur_robot_driver/URPositionHardwareInterface</plugin>