ipatests: WebUI: do not allow subid range deletion
    
    This testcase checks that subid added by user admin
    cannot be deleted.
    
    Related: https://pagure.io/freeipa/issue/9150
    
    Signed-off-by: Sudhir Menon <sumenon@redhat.com>
    Reviewed-By: Michal Polovka <mpolovka@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>