Fix Notice: Element Not Found

Not sure is this the problem for anyone else, I've got these Notice in cakePHP 2.4.1, and fixed it by altering public function element.

Hmm, maybe a array_merge can be applied to it instead of direct assigning to the third param.

Fix Notice: Element Not Found: Elements\comments\flat\main.ctp,
Element Not Found: Elements\comments\flat\paginator.ctp