[FIX] website_form: remove dynamic values on save

This fix was not forward ported when introduced: #50745

closes odoo/odoo#68980

X-original-commit: 3e5130d90127d9634c48e5301e96ddcad9b66e17
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

addons/website_form/static/src/snippets/s_website_form/000.js

@@ -100,6 +100,7 @@ odoo.define('website_form.s_website_form', function (require) {
                         var $field = self.$target.find('input[name="' + field + '"], textarea[name="' + field + '"]');
                         if (!$field.val()) {
                             $field.val(values[field]);
+                            $field.data('website_form_original_default_value', $field.val());
                         }
                     }
                 });

addons/website_form/static/src/snippets/s_website_form/options.js

@@ -369,6 +369,14 @@ options.registry.WebsiteFormEditor = FormEditor.extend({
             this.$target.removeClass('d-none');
             this.$message.addClass("d-none");
         }
+
+        // Clear default values coming from data-for/data-values attributes
+        this.$target.find('input[name],textarea[name]').each(function () {
+            var original = $(this).data('website_form_original_default_value');
+            if (original !== undefined && $(this).val() === original) {
+                $(this).val('').removeAttr('value');
+            }
+        });
     },
     /**
      * @override