message: test_ouster.launch: fixed launch in simulation
diff: <param if="$(arg use_sim_time)" name="use_sim_time" value="true"/>
  <!-- Ouster -->
  - <remap from="/os1_cloud_node/imu" to="/os1_cloud_node/imu/data_raw"/>
  - <include file="$(find ouster_ros)/os1.launch">
  + <remap unless="$(arg use_sim_time)" from="/os1_cloud_node/imu" to="/os1_cloud_node/imu/data_raw"/>
  + <include unless="$(arg use_sim_time)" file="$(find ouster_ros)/os1.launch">
  <arg name="os1_hostname" value="$(arg os1_hostname)"/>
  <arg name="os1_udp_dest" value="$(arg os1_udp_dest)"/>
  <arg if="$(arg scan_20_hz)" name="lidar_mode" value="1024x20"/>
  