forms: let default CSS visibility apply for conditional fields (#34724)

wcs/qommon/static/js/qommon.forms.js

@@ -93,7 +93,7 @@ $(function() {
           var $widget = $('[data-field-id="' + key + '"]');
           if (value.visible) {
             var was_visible = $widget.is(':visible');
-            $widget.show();
+            $widget.css('display', '');
             if ($widget.hasClass('MapWidget') && !was_visible) {
               $widget.find('.qommon-map').trigger('qommon:invalidate');
             }