Fix: LLM tool does not exist in multiple retrieval case (#12143)

### What problem does this PR solve?

 Fix LLM tool does not exist in multiple retrieval case

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/prompts/generator.py

@@ -339,7 +339,7 @@ def tool_schema(tools_description: list[dict], complete_task=False):
         }
     for idx, tool in enumerate(tools_description):
         name = tool["function"]["name"]
-        desc[f"{name}_{idx}"] = tool
+        desc[name] = tool
 
     return "\n\n".join([f"## {i+1}. {fnm}\n{json.dumps(des, ensure_ascii=False, indent=4)}" for i, (fnm, des) in enumerate(desc.items())])