pass correct add_css method

src/compiler/compile/render_dom/index.ts

@@ -529,7 +529,7 @@ export default function dom(
 				constructor(options) {
 					super(${options.dev && 'options'});
 
-					${should_add_css && b`@addCssToComponent(this, add_css, options);`}
+					${should_add_css && b`@addCssToComponent(this, ${add_css}, options);`}
 
 					@init(this, options, ${definition}, ${has_create_fragment ? 'create_fragment' : 'null'}, ${not_equal}, ${prop_indexes}, ${dirty});
 					${options.dev && b`@dispatch_dev("SvelteRegisterComponent", { component: this, tagName: "${name.name}", options, id: create_fragment.name });`}