_setOption being called with 'self' rather than 'this'

In the _setOption method the following line appears:

$.Widget.prototype._setOption.apply(self, arguments);

(line 3049 in the current full source code library)

Under some complex conditions in our code, self points to the window, not the sortable object. Changing 'self' to 'this' makes everything good.

Note: I haven't spent enough time in this code to be that this change is valid. If it's really required, maybe I can produce a test case that shows the problem, but at this point, the code is intertwined with a jquery.linkselect