Remove pointer events for disabled toggle

[tenKinetic]

Set pointer-events to none when checkbox is in toggle mode and is disabled

Description

Came across this while developing a UI and didn't see any related issues. A very simple update that just ensures when a checkbox is in toggle mode and is also disabled, the toggle cannot be manipulated.

[lubber-de]

I adopted your PR for Fomantic UI by https://github.com/fomantic/Fomantic-UI/pull/1245 In fact all variants of checkbox, not only toggle, are affected