fix destroy callback after successfull deletion

Somehow the brackets for removeNode were missing in line 323.
That's why the function wasn't called.

Author: vurral

app/assets/javascripts/jquery-fileupload/jquery.fileupload-ui.js

@@ -320,7 +320,7 @@
                         );
                     };
                 if (data.url) {
-                    $.ajax(data).done(removeNode);
+                    $.ajax(data).done(removeNode());
                 } else {
                     removeNode();
                 }