Shift one more arg off in the sync wrapper.

@@ -35,6 +35,7 @@ define(function(require) {
     var authSync = function authSync(auth, origSync, method, model, options) {
         var args = _.toArray(arguments);
         args.shift();
+        args.shift();
         var url = options.url || _.result(model, 'url');
         if (url) {
             var sessionId = auth.get('sessionId');