message: demo_husky.launch: fixed icp_odometry subscribing to both 2d and 3d lidars (choosing always 2d)
diff: <!-- 2D LiDAR -->
  <arg name="subscribe_scan" value="$(arg lidar2d)" />
  - <arg name="scan_topic" value="/scan" />
  + <arg if="$(arg lidar2d)" name="scan_topic" value="/scan" />
  + <arg unless="$(arg lidar2d)" name="scan_topic" value="/scan_not_used" />
  <!-- 3D LiDAR -->
  <arg name="subscribe_scan_cloud" value="$(arg lidar3d)" />
  - <arg name="scan_cloud_topic" value="/velodyne_points" />
  + <arg if="$(arg lidar3d)" name="scan_cloud_topic" value="/velodyne_points" />
  + <arg unless="$(arg lidar3d)" name="scan_cloud_topic" value="/scan_cloud_not_used" />
  <!-- If camera is used -->
  <arg name="depth" value="$(eval camera and not depth_from_lidar)" />
  