fix build

Signed-off-by: Ryohsuke Mitsudome <ryohsuke.mitsudome@tier4.jp>

Author: mitsudome-r

map/autoware_map_loader/test/test_lanelet2_selected_map_loader_module.cpp

@@ -30,6 +30,7 @@
 #include <utility>
 
 using autoware::map_loader::Lanelet2FileMetaData;
+using autoware::map_loader::Lanelet2MapLoaderNode;
 using autoware::map_loader::Lanelet2SelectedMapLoaderModule;
 using autoware_map_msgs::srv::GetSelectedLanelet2Map;