tslint arrow-parens rule (#4003)

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

@@ -126,7 +126,7 @@ describe('AppConfigService', () => {
     });
 
     it('should load external settings', () => {
-        appConfigService.load().then(config => {
+        appConfigService.load().then((config) => {
             expect(config).toEqual(mockResponse);
         });
     });

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

@@ -127,7 +127,7 @@ export class AppConfigService {
      * @returns Notification when loading is complete
      */
     load(): Promise<any> {
-        return new Promise(resolve => {
+        return new Promise((resolve) => {
             const configUrl = `app.config.json?v=${Date.now()}`;
 
             this.http.get(configUrl).subscribe(