ZF-3612: Should be single quotation for a needle

Description

In line 345 of file Zend_Auth_Adapter_DbTable.php

    if (empty($this->_credentialTreatment) || (strpos($this->_credentialTreatment, "?") === false)) {

I think it is better to use '?' instead of "?" as the needle for function strpos().

Comments

Updated to be inline with the coding standards. (r13201)