OZG-6564 Improve unit test

alfa-client/libs/vorgang-detail/src/lib/aktenzeichen-editable/aktenzeichen-editable.component.spec.ts

@@ -84,9 +84,7 @@ describe('AktenzeichenComponent', () => {
   });
 
   describe('after render', () => {
-    it('should render edit button', () => {
-      fixture.detectChanges();
-
+    it('should NOT render edit button', () => {
       notExistsAsHtmlElement(fixture, editButton);
     });