[slider] mouse dragging is broken on touch-capable devices

[motiz88]

On my touch-enabled laptop running the latest Chrome, Slider responds only to touch dragging and appears to ignore the mouse.

This is due to mikepb/react-draggable#5 and is fixed by mikepb/react-draggable#6, so assuming that PR is accepted, the fix here should be trivial (just update react-draggable2).

[hai-cea]

@motiz88 Are we still waiting for react-draggable2 to get released?

[igorbt]

@motiz88, I think we don't need react-draggable dependency at all. Have a look at my PR #1825.

[igorbt]

@motiz88 bug was fixed in PR #1825 and merged, please retest and close.