Fixed XenForo_Db::_execQuery & XenForo_Debug::getDatabaseDebugInfo use get_class instead of instanceof

[Xon]

Both XenForo_Db::_execQuery and XenForo_Debug::getDatabaseDebugInfo use get_class rather than instanceof.

This means classes which extend Zend_Db_Adapter_Mysqli which have the same capabilities as Zend_Db_Adapter_Mysqli, are not treated the same.

 

[Mike]

I've changed these two places, thanks.