post请求 formData表单类型回放失败

### Search before asking

- [x] I have searched the existing [issues](https://github.com/arextest/arex-agent-java/issues) before asking.

### AREX Test Service

AREX Java Agent (arextest/arex-agent-java)

### Current Behavior

post请求 formData表单类型的，查看录制详情入参是加密的，，
回放出现失败：

### Expected Behavior

回放结果符合预期，与录制保持一致

### Steps To Reproduce

回放时入参全部为null

### Anything else

_No response_

### Are you willing to submit a pull request to fix on your own?

- [ ] Yes I am willing to submit a pull request on my own!