Draggable prevents scrolling when disabled on touch devices

[zspitzer]

When you apply draggable to an element, the ui-draggable-handle class is applied to the element which prevents scrolling on touch devices.

.ui-draggable-handle { -ms-touch-action: none; touch-action: none; } 

But when draggable is disabled on the element, the class isn't removed, which means you cannot touch scroll the page via that element.

When draggable is disabled, this class should be removed from the element

[Scott González]

​https://github.com/jquery/jquery-ui/pull/1714

[Scott González]

This also applies to sortable and selectable. Everything else that uses touch-action should be fine.