Fixed widget.js 404 error

[daguiler]

Fixes #3630

Summary

The updated jquery.fileupload.js file changed the way it references the widget factory from this:

if (typeof define === 'function' && define.amd) {
  // Register as an anonymous AMD module:
  define([
    'jquery',
    'jquery.ui.widget'
  ], factory);
} else ...

to this:

if (typeof define === 'function' && define.amd) {
  // Register as an anonymous AMD module:
  define([
    'jquery',
    'jquery-ui/ui/widget'
  ], factory);
} else ...

and since this standalone jquery-ui/ui/widget.js file doesn't exist, it returns a 404, causing dependent modules to fail. The needed widget factory is actually included in the jquery-ui.min.js file.
After reverting this path, the module loads fine again: