add missing ngInject comment. fixes #4501

public/app/features/plugins/import_list/import_list.ts

@@ -10,6 +10,7 @@ export class DashImportListCtrl {
   plugin: any;
   datasource: any;
 
+  /** @ngInject */
   constructor($scope, private $http, private backendSrv, private $rootScope) {
     this.dashboards = [];