F36: Remove "gnome-screenshot" from the gnome-desktop group
    
    GNOME has a new screenshot UI for 42, which will be coming in F36.
    That new UI is provided by GNOME Shell, so the old gnome-screenshot
    app will need to be removed, to avoid duplication.
    
    There's a corresponding upstream ticket here - https://gitlab.gnome.org/GNOME/gnome-build-meta/-/issues/479
    
    Fixes https://pagure.io/fedora-workstation/issue/277