Update app.py

app.py

@@ -32,7 +32,7 @@ def duplicate(source_repo, dst_repo, token, repo_type):
     else:
         repo = Repository(local_dir=local_dir, clone_from=full_path)
     
-    files = listdir(local_dir)
+    files = os.listdir(local_dir)
     for f in files: 
       if not f.startswith("."):
         upload_file(os.path.join(local_dir, f), f, dst_repo, token=token, repo_type=repo_type)