Update app.py to fix mistral moderation passing to metadata

app.py

@@ -84,7 +84,7 @@ async def check_safety(message: str, metadata: dict) -> dict:
         # Mistral moderation results
         try:
             mistral_response = await get_mistral_moderation(user_content, message)
-            mistral_results = mistral_response.results
+            mistral_results = mistral_response
         except Exception as e:
             print(f"[Mistral moderation error]: {str(e)}")
             mistral_results = None