Import-Ini can't resolve pester's TestDrive:\

Since the last refactoring, Import-Ini now uses [System.IO.File]::ReadAllLines() for reading the content of files.
This method is not able to resolve TestDrive:\ from Invoke-Pester.

The pester tests of the module are working around this be using [System.IO.Path]::GetTempPath() instead.
But if this module is used within pester tests of someone else, this could break the tests.

Fixed reading from `TestDrive:\`