Update Utilities.php

PHP Namespace issue fix

014/03/20 10:13:17 [error] "PHP message: PHP Fatal error:  Class 'DG\T3Less\Utility\RecursiveArrayIterator' not found in /var/customers/rise2reality.com/webs/typo3conf/ext/t3_less/Classes/Utility/Utilities.php on line 42"