Brightness settings uses default brightness value when at minimum on some devices

[Sought]

Steps to reproduce:

• Open any EPUB, go to settings, and move the brightness scrollbar to the lowest value possible

Result expected:

• Minimal value.

Result observed:

• Default brightness was used.

Tested on:

• Xiaomi A3 phone - does have the issue
• Huawei BTV-W09 tablet - doesn't have this issue.

What to do?

• https://developer.android.com/reference/android/view/WindowManager.LayoutParams.html#screenBrightness

The code present in UserSettings.kt probably sets the screen brightness to a near 0 float value that is negative. An hotfix snippet setting it to 0.01.toFloat() fixed the issue.