Removing the IE8 PATCH requests fix

Patch requests were not working on IE8, even with the Backbone fix (tested on XP/IE8 with modern.ie VMs).

````
Remove this line when jQuery supports `PATCH` on IE8.
````

jQuery 1.11.* and the corresponding 2.x version now support PATCH requests (see: http://bugs.jquery.com/ticket/13240)

It now works as expected with jQuery