Update app.py

app.py

@@ -129,7 +129,7 @@ def download_file(url, filename, folder="."):
         response.raise_for_status()
     except requests.exceptions.HTTPError as e:
         if api_key and response.status_code == 401: 
-            headers['Authorization'] = f'Bearer {os.environ['CIVITAI_API']}'
+            headers['Authorization'] = f'Bearer {os.environ["CIVITAI_API"]}'
             try:
                 response = requests.get(url, headers=headers)
                 response.raise_for_status()