[Mac] Double clicking a test in Tests list opens an empty file

#### OS and platforms
- Windows/Mac
- Unity 2020
- AUT v 1.7.0

#### Prerequisites
Having C# AltUnity Tests created in Unity Editor (in an _Editor_ folder)

#### Steps
1. In the unity project go in _AltUnity Tester Editor_ > _Tests list_ section
2. Expand the tests folder until reaching the tests
3. Click on a test and check what happens >>
- **Actual result**: A different test file with the correct name is opened in the IDE but it is empty
- **Expected result**: The correct test file is opened in the IDE, contains all the tests written in it and the cursor is at the beginning of the name of the clicked test

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_{You can find the original issue from GitLab [here](https://gitlab.com/altom/altunity/altunitytester/-/issues/805).}