fix TypeORM error "Empty criteria(s) are not allowed for the delete method."

- https://github.com/typeorm/typeorm/issues/11455
- https://github.com/typeorm/typeorm/pull/11459

packages/backend/test/unit/AnnouncementService.ts

@@ -116,10 +116,10 @@ describe('AnnouncementService', () => {
 
 	afterEach(async () => {
 		await Promise.all([
-			app.get(DI.metasRepository).delete({}),
-			usersRepository.delete({}),
-			announcementsRepository.delete({}),
-			announcementReadsRepository.delete({}),
+			app.get(DI.metasRepository).deleteAll(),
+			usersRepository.deleteAll(),
+			announcementsRepository.deleteAll(),
+			announcementReadsRepository.deleteAll(),
 		]);
 		moderationLogService.log.mockReset();
 		globalEventService.publishMainStream.mockReset();