Airtest在连接unity editor模式后，在初始化 UnityPoco(unity_editor=True)时报错

**描述问题bug**
Airtest在连接unity editor模式下，初始化 UnityPoco(unity_editor=True)时报错

```
File "C:\Users\AppData\Local\Programs\Python\Python37\lib\site-packages\pywinauto\findwindows.py", line 87, in find_element
raise ElementNotFoundError(kwargs)
pywinauto.findwindows.ElementNotFoundError: {'class_name': 'UnityContainerWndClass', 'title_re': 'Unity.*', 'backend': 'win32'}
```

**python 版本:** `python3.7`
**airtest 版本:** `1.1.8`
**pocoui 版本:** `1.0.81`