[FIX] website_sale: fix list view variant JS error

Part of https://github.com/odoo/odoo/pull/37135


task-2070507

closes odoo/odoo#38342

X-original-commit: a273a53d
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/website_sale/static/src/js/website_sale.js

@@ -211,7 +211,7 @@ publicWidget.registry.WebsiteSale = publicWidget.Widget.extend(VariantMixin, {
             .data('combination');
 
         if (combination) {
-            return JSON.parse(combination);
+            return combination;
         }
         return VariantMixin.getSelectedVariantValues.apply(this, arguments);
     },