[FIX] website_sale_product_configurator: fix continue shop

When selecting the "Continue shopping" option after adding a
configurable product from the products page with "Add to Cart" enabled
the top navbar was not updated.

Part of https://github.com/odoo/odoo/pull/37132

task-2070507

closes odoo/odoo#38538

X-original-commit: https://github.com/odoo/odoo/commit/9e58f0659e21d0f7e63b127d7a84b505e6aa1fb5


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

addons/website_sale_product_configurator/static/src/js/website_sale_options.js

@@ -81,7 +81,7 @@ publicWidget.registry.WebsiteSale.include({
                 window.location.pathname = path;
             }
             var $quantity = $(".my_cart_quantity");
-            $quantity.parent().parent().removeClass("d-none", !quantity);
+            $quantity.parent().parent().removeClass('d-none');
             $quantity.html(quantity).hide().fadeIn(600);
         });
     },