Fix for preview urls.

src/Squidex/app/shared/services/schemas.service.spec.ts

@@ -236,7 +236,7 @@ describe('SchemasService', () => {
 
         const resource: Resource = {
             _links: {
-                updateUrls: { method: 'PUT', href: '/api/apps/my-app/schemas/my-schema/preview-urls' }
+                ['update/urls'] { method: 'PUT', href: '/api/apps/my-app/schemas/my-schema/preview-urls' }
             }
         };
 

src/Squidex/app/shared/services/schemas.service.ts

@@ -325,7 +325,7 @@ export class SchemasService {
     }
 
     public putPreviewUrls(appName: string, resource: Resource, dto: {}, version: Version): Observable<SchemaDetailsDto> {
-        const link = resource._links['updateUrls'];
+        const link = resource._links['update/urls'];
 
         const url = this.apiUrl.buildUrl(link.href);