fix(playlist): add nginject for prod build

public/app/core/components/grafana_app.ts

@@ -139,6 +139,7 @@ export class GrafanaCtrl {
   }
   }
 }
 }
 
 
+/** @ngInject */
 export function grafanaAppDirective(playlistSrv) {
 export function grafanaAppDirective(playlistSrv) {
   return {
   return {
     restrict: 'E',
     restrict: 'E',