Update rollup.config.js

Fix `configOnlyModule` usage.

utils/build/rollup.config.js

@@ -198,4 +198,4 @@ const builds = [
 	}
 ];
 
-export default ( args ) => args.configOnlyModule ? builds.slice( 0, 4 ) : builds;
+export default ( args ) => args.configOnlyModule ? builds.slice( 0, 3 ) : builds;