WebUI: suppress truncation warning in select widget
    
    This widget is used on details pages and dialogs. When the size limit
    is set to lower number the warning about truncation was shown every time
    the details page was open.
    
    Now, with support for suppressing warning messages from server according
    to its code, we are able to disable warning with 13017 code (truncation
    warning)
    
    https://pagure.io/freeipa/issue/6618
    
    Reviewed-By: Petr Vobornik <pvoborni@redhat.com>