Update prompts.yaml

prompts.yaml

@@ -318,7 +318,7 @@
     Here is the final answer from your managed agent '{{name}}':
     {{final_answer}}
     
-"final_answer": {
+"final_answer": 
   "pre_messages": |-
     Based on the previous steps, formulate a final answer to the question.
     Task: 
@@ -327,5 +327,4 @@
     ```
   "post_messages": |-
     Now formulate the final answer using the final_answer tool:
-}