Update app.py (#29)

- Update app.py (c8b63b6163fe45c44b3b7581735183cd940f8798)

app.py

@@ -8,7 +8,7 @@ from typing import Union
 
 def download_file(media_type, digest, image):
     url = f"https://registry.ollama.ai/v2/library/{image}/blobs/{digest}"
-    f_tag = {media_type.split('.')[-1]}
+    f_tag = media_type.split('.')[-1]
     if f_tag == "model":
         f_tag = "model.gguf"
     file_name = f"blobs/{f_tag}"