test: use exist_ok when making updated dir (typo...)

tests/run_replay_tests.py

@@ -720,7 +720,7 @@ def on_result_updated(w: ReplayResultUpdatedHandler):
             # .zplay files are updated in-place, but lets also copy over to the test output folder.
             # This makes it easy to upload an archive of updated replays in CI.
             if mode == 'update' and watcher.result['changed']:
-                (test_results_dir / 'updated').mkdir(exists_ok=True)
+                (test_results_dir / 'updated').mkdir(exist_ok=True)
                 shutil.copy2(replay_file, test_results_dir / 'updated' / replay_file.name)
             break
         except ReplayTimeoutException: