forms: notify when timetable value changes (#51413)

wcs/qommon/templates/qommon/forms/widgets/select-timetable.html

@@ -157,6 +157,7 @@ $(function() {
    $('#form_{{widget.name}}_table span').removeClass('on');
    $(this).addClass('on');
    $('#form_{{widget.name}}').val($(options[$(this).data('idx')]).attr('value'));
+   $select.trigger('wcs:change');
   });
 });
   $select.trigger('wcs:options-change');