sim with small drift

src/sherpa/launch/simulator.launch.py

@@ -49,7 +49,7 @@ def generate_launch_description():
     controller = Node(
         package='controller_manager',
         executable='spawner',
-        arguments=['mecanum_controller'],
+        arguments=['ackermann_controller'],
         output='screen'
     )
 
@@ -89,7 +89,7 @@ def generate_launch_description():
         arguments=[
             "--ros-args",
             "-p",
-            f"config_file:={os.path.join(get_package_share_directory('sherpa'), 'config', 'gz_bridge.yaml')}",
+            f"config_file:={os.path.join(pkg_share, 'config', 'gz_bridge.yaml')}",
         ]
     )