change buildtool to test dependency

Author: berndpfrommer

package.xml

@@ -9,11 +9,11 @@
 
   <buildtool_depend>ament_cmake</buildtool_depend>
   <buildtool_depend>ament_cmake_ros</buildtool_depend>
-  <buildtool_depend>ament_cmake_clang_format</buildtool_depend>
   <buildtool_depend>ros_environment</buildtool_depend>
 
   <test_depend>ament_lint_auto</test_depend>
   <test_depend>ament_lint_common</test_depend>
+  <test_depend>ament_cmake_clang_format</test_depend>
 
   <depend>cv_bridge</depend>
   <depend>rclcpp</depend>