it would never expose items if `disabled` is false on first render

Not sure if this component is still under maintenance...

Here I'd report 2 bugs of this component.

1. it would never expose items if `disabled` is false on first render
2. it disappears when `disabled` become false

I've made a codesandbox demo for reproducing them.

https://codesandbox.io/s/rc-swipeout-defects-k3c23r
