tslint arrow-parens rule (#4003)

lib/core/mock/app-config.service.mock.ts

@@ -35,7 +35,7 @@ export class AppConfigServiceMock extends AppConfigService {
     }
 
     load(): Promise<any> {
-        return new Promise(resolve => {
+        return new Promise((resolve) => {
             resolve(this.config);
         });
     }

lib/core/mock/cookie.service.mock.ts

@@ -36,7 +36,7 @@ export class CookieServiceMock extends CookieService {
 
     /** @override */
     clear() {
-        Object.keys(this).forEach(key => {
+        Object.keys(this).forEach((key) => {
             if (this.hasOwnProperty(key) && typeof(this[key]) !== 'function') {
                 this[key] = undefined;
             }