Ui test: wait for iframe before taking screenshot

tests/UI/specs/OptOutForm_spec.js

@@ -28,7 +28,7 @@ describe("OptOutForm", function () {
             page.evaluate(function () {
                 $('iframe#optOutIframe').contents().find('input#trackVisits').click();
             });
-            page.wait(1000); // wait for iframe to reload
+            page.wait(2000); // wait for iframe to reload
         }, done);
     });