Fix app.py (list models returns a generator, not a list anymore)

app.py

@@ -73,7 +73,7 @@ def retrieve_model_stats():
             "download_per_model": 0,
             "modality": modality,
         }
-        models = hf_api.list_models(filter=model_name)
+        models = list(hf_api.list_models(filter=model_name))
 
         model_stats["num_models"] = len(models)
         model_stats["num_downloads"] = sum(