Effect: ui-effects-wrapper now respects element's display property.

A small fix to Effect. After the fix, `div.ui-effects-wrapper` will respect the element's CSS `display` property.

Try [this fiddle](http://jsfiddle.net/euyuil/EERQr/) written using jQuery UI **before** this fix (jQuery 1.10.2, jQuery UI 1.10.3).