Widget: Stop setting ui-state-disabled and aria by default on setting disabled option.

Fixes #5973 - Resizable: disabled should not have the ui-state-disabled class or aria attribute aria-disabled
Fixes #5974 - Draggable: disabled should not have the ui-state-disabled class or aria attribute aria-disabled
Fixes #6039 - Droppable : disabled should not have ui-state-disabled