file_upload.js: supprime un bout de code inutile.

Resources/js/widget/file_upload.js

@@ -11,12 +11,10 @@
         var $this             = $(this),
             $button           = $this.find('.fileinput-button'),
             $entries          = $this.find('.fileinput-entries'),
-            prototype         = options.prototype,
             createUrl         = options.createUrl,
             uploadPrototype   = options.uploadPrototype,
             downloadPrototype = options.downloadPrototype;
 
-        delete options.prototype;
         delete options.createUrl;
         delete options.uploadPrototype;
         delete options.downloadPrototype;