fix bug

app.py

@@ -231,7 +231,7 @@ def ask_with_history_v3(query: str, conversation_id: str, isFirst,cid,mode):
     prompt = prompt_formatter(mode,query=query, context_items=context_items, history=parsed_conversation, isFirst=isFirst)
     
     genai.configure(api_key="AIzaSyDluIEKEhT1Dw2zx7SHEdmKipwBcYOmFQw")
-    model = genai.GenerativeModel("gemini-1.5-flash",system_instruction="Không được in đậm in nghiêng bất cứ dòng nào trong câu trả lời.")
+    model = genai.GenerativeModel("gemini-1.5-flash")
     response = model.generate_content(prompt, stream=True)
     
     for chunk in response: