Android Pie Screen Brightness Workaround v1.3

- New: Different method to get min/max values (no root nor special permissions needed). (Thanks to @mehPhone from Reddit for sharing)
- Other: As min/max values can be retrieved without the need of root or special permissions, there's no need to get/set any of these values anymore.
- Other: Re-worked 'Initial Setup' task.
- Other: Other minor changes.