Reverted string format of gz_args (#77)

Author: jazzalin

ur_simulation_gz/launch/ur_sim_control.launch.py

@@ -171,15 +171,15 @@ def launch_setup(context, *args, **kwargs):
         PythonLaunchDescriptionSource(
             [FindPackageShare("ros_gz_sim"), "/launch/gz_sim.launch.py"]
         ),
-        launch_arguments={"gz_args": ["-r", "-v", "4", world_file]}.items(),
+        launch_arguments={"gz_args": [" -r -v 4 ", world_file]}.items(),
         condition=IfCondition(gazebo_gui),
     )
 
     gz_launch_description_without_gui = IncludeLaunchDescription(
         PythonLaunchDescriptionSource(
             [FindPackageShare("ros_gz_sim"), "/launch/gz_sim.launch.py"]
         ),
-        launch_arguments={"gz_args": ["-s", "-r", "-v", "4", world_file]}.items(),
+        launch_arguments={"gz_args": [" -s -r -v 4 ", world_file]}.items(),
         condition=UnlessCondition(gazebo_gui),
     )