If using Airtest adb.exe, import trace outputs ModuleNotfoundError. However, Module can be imported if using Python's default adb.exe.

**Python version:** `python3.7.2`
**AirtestIDE version:** `V1.2.0`
**Poco version:** `pocoui==1.0.76`
**Airtest version:** `airtest==1.0.27`

**Describe the bug**
When using Airtest adb.exe to run `import trace`, Airtest shows ModuleNotFoundError.
When using Python adb.exe to run `import trace`. No error.

**Using Airtest adb.exe**
`\AirtestIDE_2019-01-15\AirtestIDE_2019-01-15_py3_win64\airtest\core\android\static\adb\windows\adb.exe`

```
ERROR: runTest (app.widgets.code_runner.ide_launcher.AirtestIDECase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "airtest\cli\runner.py", line 66, in runTest
File "site-packages\six.py", line 693, in reraise
File "airtest\cli\runner.py", line 62, in runTest
File "E:\Stuff\AirtestPocoProjects\SecretGameRobot.air\SecretGameRobot.air\SecretGameRobot.py", line 175, in
import ThreadWithTrace
File "E:\Stuff\AirtestPocoProjects\SecretGameRobot.air\SecretGameRobot.air\ThreadWithTrace.py", line 7, in
import trace
ModuleNotFoundError: No module named 'trace'
```
**Using Python adb.exe**
No problem

**To Reproduce**
Steps to reproduce the behavior:
1. Open empty project in Airtest v1.2.0, with default python path set by airtest
2. Type import trace
3. Run code
4. See error

**Expected behavior**
Airtest adb.exe should be able to import trace , because it is found in Python37 > Lib

**Screenshots**
My ThreadWithTrace class that outputs error when run using Airtest adb.exe

**Smartphone (please complete the following information):**
- Device: Pocophone F1
- Android Version : Android 9 PKQ1.18076