Error when trying to open AltUnityTest with same name as folder in project

## Steps to reproduce

1. Open in Unity the _altunitytester_ project (cloned repo)
2. In _Assets_ > _Editor_ folder create an _AltUnityTest_ with the name `test`
- _Note_: the name is also the name of a folder in the project
3. Go to _AltUnity Tester Editor_ window and `Refresh` the _Tests list_
4. Find the created test and double-click on it in order to open it
5. Check if it opens and the console for errors.

## Actual result

### AR

In step 5 the test file cannot be opened and in the console, there is an error:
```
Access to the path 'D:\AltUnity Tools\AltUnity Tester\altunitytester\Assets\AltUnityTester' is denied.
System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) (at :0 ...
```

### Additional info

Screenshot


## Expected result

### ER

In step 5 the test file should be opened and in the console should be no error

---
_{You can find the original issue from GitLab [here](https://gitlab.com/altom/altunity/altunitytester/-/issues/906).}