Update code fix rivo slide version 2.4.6

\app\code\Nwdthemes\Revslider\Block\Adminhtml\Gallery\Tree.php \app\code\Nwdthemes\Revslider\Helper\Framework.php \app\code\Nwdthemes\Revslider\Helper\Plugin.php \app\code\Nwdthemes\Revslider\Helper\Query.php \app\code\Nwdthemes\Revslider\Observer\LayoutLoadBefore.php