Update ContatosController.php

Avoid these errors:

Strict standards: Only variables should be passed by reference in C:\xampp\htdocs\ZF2\module\Contato\src\Contato\Controller\ContatosController.php on line 82


 Strict standards: Only variables should be passed by reference in C:\xampp\htdocs\ZF2\module\Contato\src\Contato\Controller\ContatosController.php on line 87