refac: system prompt template

backend/open_webui/functions.py

@@ -250,7 +250,7 @@ async def generate_function_chat_completion(
 
         params = model_info.params.model_dump()
         form_data = apply_model_params_to_body_openai(params, form_data)
-        form_data = apply_model_system_prompt_to_body(params, form_data, user)
+        form_data = apply_model_system_prompt_to_body(params, form_data, metadata, user)
 
     pipe_id = get_pipe_id(form_data)
     function_module = get_function_module_by_id(request, pipe_id)