Droppable changes options object

based on this discussion

http://groups.google.com/group/jquery-ui-dev/browse_thread/thread/abf6a10a8af2cac7

Droppable shouldn't modify the accept option, but should add a key to the widget object itself.

Change line 23 from

this.options.accept = accept && $.isFunction(accept) ? accept : function(d) {

to

this.accept = $.isFunction(accept) ? accept : function(d) {

and line 53 from

this.options.accept = value && $.isFunction(value) ? value : function(d) {

to

this.accept = $.isFunction(value) ? value : function(d) {

(I also removed the unnecessary guard expressions)

and change all the this.options.accept.call expressions to this.accept.call