Remove obsolete disableExifThumbnail option.

Use the includeExifTags and excludeExifTags options instead, see also:
https://github.com/blueimp/JavaScript-Load-Image/blob/master/README.md#exif-parser-options

Author: blueimp

js/jquery.fileupload-image.js

@@ -52,7 +52,6 @@
       disableImageHead: '@',
       disableMetaDataParsers: '@',
       disableExif: '@',
-      disableExifThumbnail: '@',
       disableExifOffsets: '@',
       includeExifTags: '@',
       excludeExifTags: '@',