fix component rewrite bug (#2549)

### What problem does this PR solve?

#2545

### Type of change

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

agent/component/rewrite.py

         chat_mdl = LLMBundle(self._canvas.get_tenant_id(), LLMType.CHAT, self._param.llm_id)
         ans = chat_mdl.chat(self._param.get_prompt(), [{"role": "user", "content": q}],
                             self._param.gen_conf())
+        self._canvas.history.pop()
+        self._canvas.history.append(("user", ans))
 
         print(ans, ":::::::::::::::::::::::::::::::::")
         return RewriteQuestion.be_output(ans)