Fineuploader: temporary hack to allow PATCH requests

Waiting for https://github.com/FineUploader/fine-uploader/issues/734
Need a more obvious comment style to indicate that we changed this ourselves. Also, I thought we were forking this? If so, please add a note to the top of this file and to the readme.md of this repo of how best to update fineuploader. See the example I set for ckeditor.