Allow Group Admins to delete Users from their group fixes xibosignage/xibo#2635
Allow Group Admins to delete Users from their group
fixes xibosignage/xibo#2635

(cherry picked from commit 95e97ea7587945efa47f847af63c2bc8a5d78464)

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