[Bug report] Scrollbar doesn't hide when using custom classnames

[adjourn]

🐛 Bug

Current Behavior

If you use custom classnames, scrollbar doesn't hide when it should be, it doesn't hide at all. This can't be avoided by not passing custom visible classname because class will be undefined then (see #228).

Expected behavior

Scrollbar should hide if cursor doesn't move for X amount of time or is moving out of scroll area.

Suggested solution

Bug is right here: https://github.com/Grsmto/simplebar/blob/master/packages/simplebar/src/simplebar.js#L569-L582

visible is hardcoded in hideScrollbars method, it should be this.classNames.visible.

Environment

SimpleBar 3.1.0-beta.5

[adjourn]

Fixed in #239, closing.