fix(client:oauthButtons): add ngInject

fixes #2206

Author: Awk34

Diff for: templates/app/client/components/oauth-buttons(oauth)/index.js

@@ -2,6 +2,7 @@
 import angular from 'angular';
 
 export function OauthButtonsController($window) {
+  'ngInject';
   this.loginOauth = function(provider) {
     $window.location.href = '/auth/' + provider;
   };