build(path_smoother): add include directory to CMake target

Signed-off-by: Esteve Fernandez <esteve.fernandez@tier4.jp>

Author: esteve

planning/path_smoother/CMakeLists.txt

@@ -25,9 +25,7 @@ if(BUILD_TESTING)
   ament_add_ros_isolated_gtest(test_${PROJECT_NAME}
     test/test_${PROJECT_NAME}_node_interface.cpp
   )
-  target_link_libraries(test_${PROJECT_NAME}
-    ${PROJECT_NAME}
-  )
+  target_link_libraries(test_${PROJECT_NAME} path_smoother)
 endif()
 
 ament_auto_package(