Layout Import : Fix audio nodes in loadByJson fixes xibosignage/xibo#2603
Layout Import : Fix audio nodes in loadByJson
fixes xibosignage/xibo#2603

(cherry picked from commit e791ae31d8c6f1536920b20e9d465d064b3b50d7)

xibosignage/xibo-cms,xibosignage/xibo-cms,dasgarner/xibo-cms,dasgarner/xibo-cms,xibosignage/xibo-cms,xibosignage/xibo-cms,xibosignage/xibo-cms,xibosignage/xibo-cms,dasgarner/xibo-cms,dasgarner/xibo-cms,dasgarner/xibo-cms,dasgarner/xibo-cms