FIX: move sprockets customization to monkeypatch

plugin.rb

@@ -35,8 +35,8 @@ if respond_to?(:register_svg_icon)
   register_svg_icon "save"
 end
 
-
-add_to_class(::Sprockets::DirectiveProcessor, :process_require_tree_discourse_directive) do |path = "."|
+class ::Sprockets::DirectiveProcessor
+  def process_require_tree_discourse_directive(path = ".")
     raise CustomWizard::SprocketsEmptyPath, "path cannot be empty" if path == "."
 
     discourse_asset_path = "#{Rails.root}/app/assets/javascripts/"
@@ -48,6 +48,7 @@ add_to_class(::Sprockets::DirectiveProcessor, :process_require_tree_discourse_di
     else
       raise CustomWizard::SprocketsFileNotFound, "#{path} not found in discourse core"
     end
+  end
 end
 
 after_initialize do