Remove imu system plugin from the robot (#11) (#12)

(cherry picked from commit c1b3f3b)

Co-authored-by: Jan Hernas <40989249+jasiex01@users.noreply.github.com>

Author: mergify[bot]

leo_description/urdf/macros.xacro

@@ -505,9 +505,6 @@
         name="ignition::gazebo::systems::JointStatePublisher">
         <topic>${link_prefix}joint_states</topic>
       </plugin>
-      <plugin filename="libignition-gazebo-imu-system.so"
-        name="ignition::gazebo::systems::Imu">
-      </plugin>
     </gazebo>
 
     <gazebo reference="${link_prefix}imu_frame">