message: Updated hector demo to fix assert on wrong covariance
diff: <param name="subscribe_depth" type="bool" value="true"/>
  <param name="subscribe_scan" type="bool" value="true"/>
  - <remap from="odom" to="/scanmatch_odom"/>
  <remap from="scan" to="/jn0/base_scan"/>
  <remap from="rgb/image" to="/data_throttled_image"/>
  <param name="rgb/image_transport" type="string" value="compressed"/>
  <param name="depth/image_transport" type="string" value="compressedDepth"/>
  + <!-- As hector doesn't provide compatible covariance in the odometry topic, don't use the topic and fix the covariance -->
  + <param if="$(arg hector)" name="odom_frame_id" type="string" value="hector_map"/>
  + <param if="$(arg hector)" name="odom_tf_linear_variance" type="double" value="0.0005"/>
  + <param if="$(arg hector)" name="odom_tf_angular_variance" type="double" value="0.0005"/>
  +
  + <remap unless="$(arg hector)" from="odom" to="/scanmatch_odom"/>
  + <param unless="$(arg hector)" name="subscribe_odom_info" type="bool" value="true"/>
  +
  <!-- RTAB-Map's parameters -->
  <param name="Reg/Strategy" type="string" value="1"/> <!-- 0=Visual, 1=ICP, 2=Visual+ICP -->
  - <param name="Vis/MaxDepth" type="string" value="10.0"/> <!-- 3D visual words maximum depth 0=infinity -->
  - <param name="Vis/InlierDistance" type="string" value="0.1"/> <!-- 3D visual words correspondence distance -->
  <param name="Reg/Force3DoF" type="string" value="true"/>
  <param name="RGBD/ProximityBySpace" type="string" value="false"/>
  </node>
  <param name="subscribe_depth" type="bool" value="true"/>
  <param name="subscribe_laserScan" type="bool" value="true"/>
  <param name="frame_id" type="string" value="base_footprint"/>
  - <param unless="$(arg hector)" name="subscribe_odom_info" type="bool" value="true"/>
  <remap from="rgb/image" to="/data_throttled_image"/>
  <remap from="depth/image" to="/data_throttled_image_depth"/>
  <remap from="rgb/camera_info" to="/data_throttled_camera_info"/>
  <remap from="scan" to="/jn0/base_scan"/>
  - <remap from="odom" to="/scanmatch_odom"/>
  -
  <param name="rgb/image_transport" type="string" value="compressed"/>
  <param name="depth/image_transport" type="string" value="compressedDepth"/>
  +
  + <!-- As hector doesn't provide compatible covariance in the odometry topic, don't use the topic and fix the covariance -->
  + <param if="$(arg hector)" name="odom_frame_id" type="string" value="hector_map"/>
  +
  + <remap unless="$(arg hector)" from="odom" to="/scanmatch_odom"/>
  + <param unless="$(arg hector)" name="subscribe_odom_info" type="bool" value="true"/>
  </node>
  </group>
  