update Default sync mode

Author: jian-dong

orbbec_camera/launch/gemini_330_series.launch.py

@@ -71,7 +71,7 @@ def generate_launch_description():
         DeclareLaunchArgument('enable_soft_filter', default_value='true'),
         DeclareLaunchArgument('soft_filter_max_diff', default_value='-1'),
         DeclareLaunchArgument('soft_filter_speckle_size', default_value='-1'),
-        DeclareLaunchArgument('sync_mode', default_value='free_run'),
+        DeclareLaunchArgument('sync_mode', default_value='standalone'),
         DeclareLaunchArgument('depth_delay_us', default_value='0'),
         DeclareLaunchArgument('color_delay_us', default_value='0'),
         DeclareLaunchArgument('trigger2image_delay_us', default_value='0'),