refactor: Avoid redundant async

test/archive_test.dart

@@ -6,5 +6,6 @@ void main() {
       testWidget: Archive(),
       testClient: await testClient(loggedIn: true),
     ));*/
+    return;
   });
 }

test/homeserver_picker_test.dart

@@ -13,5 +13,6 @@ void main() {
         testWidget: HomeserverPicker(),
       ),
     );*/
+    return;
   });
 }

test/widget_test.dart

@@ -16,5 +16,6 @@ void main() {
     /* await tester.pumpWidget(FluffyChatApp(
       client: await prepareTestClient(),
     ));*/
+    return;
   });
 }