fix(static_centerline_generator): save_map only once (#7770)

Signed-off-by: Takayuki Murooka <takayuki5168@gmail.com>

Author: takayuki5168

Diff for: planning/autoware_static_centerline_generator/scripts/centerline_updater_helper.py

@@ -162,6 +162,13 @@ def onSaveMapButtonPushed(self, event):
         msg = Empty()
         self.pub_save_map.publish(msg)
 
+        # NOTE: After saving the map, the generated centerline is written
+        # in original_map_ptr_ in static_centerline_generator_node.
+        # When saving the map again, another centerline is written without
+        # removing the previous centerline.
+        # Therefore, saving the map can be called only once.
+        self.widget.save_map_button.setEnabled(False)
+
     def onValidateButtonPushed(self, event):
         msg = Empty()
         self.pub_validate.publish(msg)