fix: changed loc_config_path declaration from let to arg (#1204)

Changed loc_config_path declaration from let to arg

Signed-off-by: Shintaro Sakoda <[email protected]>

autoware_launch/launch/components/tier4_localization_component.launch.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <launch>
-  <let name="loc_config_path" value="$(find-pkg-share autoware_launch)/config/localization"/>
+  <arg name="loc_config_path" default="$(find-pkg-share autoware_launch)/config/localization"/>
   <arg name="pose_source" default="ndt" description="select pose_estimator: ndt, yabloc, eagleye"/>
   <arg name="twist_source" default="gyro_odom" description="select twist_estimator. gyro_odom, eagleye"/>
   <arg name="input_pointcloud" default="/sensing/lidar/concatenated/pointcloud" description="The topic will be used in the localization util module"/>