Update app.py

app.py

@@ -10,7 +10,7 @@ model_filename="nous-hermes-13b.ggmlv3.q4_K_S.bin"
 #model="TheBloke/Nous-Hermes-13B-GGML"
 #model="https://huggingface.co/TheBloke/Nous-Hermes-13B-GGML/resolve/main/nous-hermes-13b.ggmlv3.q4_K_S.bin"
 
-def download_model:
+def download_model():
     # See https://github.com/OpenAccess-AI-Collective/ggml-webui/blob/main/tabbed.py
     repo_id = hub_config.pop("repo_id")
     filename = hub_config.pop("filename")