Update core/components/phpthumbof/model/phpthumbof/phpthumbof.class.php

urldecode should be left down to the user and not automatically done, this
has caused me so much trouble as I was using urlencode in order to fix spaces
in url but phpthumb would fail when it tries to do file_get_contents on line
3210 of phpthumb.class.php [https://github.com/modxcms/revolution/blob/develop/core/model/phpthumb/phpthumb.class.php#L3210]