Check Layout background Image released flag fixes xibosignage/xibo#2627
Check Layout background Image released flag
fixes xibosignage/xibo#2627

(cherry picked from commit b2772df17fea601c038d64b2b32e232e461ed71a)

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