Clean up KDE package lists
    
    fedora-kde-minimization.ks only tried to remove scim* and iok.
    iok hasn't existed since F30. scim* packages still exist, but
    nothing requires or recommends any of them, and none of them are
    listed as default or mandatory in comps, so I don't think this
    does anything.
    
    mariadb: we do still ship both mariadb and community-mysql, and
    they have overlapping provides. However, the only thing that
    requires 'mysql-server' is kf5-akonadi-server-mysql , and that
    also recommends 'mariadb-server', which should break the tie
    without needing these lines.
    
    system-config-*: none of these exist any more.
    
    desktop-backgrounds-basic: no longer listed in base-x.
    
    gnome-disk-utility: we already drop the entire admin-tools
    group above, so there's no need to try and drop one package from
    it too.
    
    kdeaccessibility and kdeartwork don't exist any more.
    
    Commented-out lines were dropped, there's no point having
    commented-out lines with no explanation why they're there.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>