[FIX] website_sale: wait dom ready to bind popover

Add 'base' as a requirement to be sur that dom is ready
before to bind the popover on the cart.

Without it, the popver is just never displayed.

Bug introduced during ref 71732dc.

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

@@ -1,6 +1,7 @@
 odoo.define('website_sale.cart', function (require) {
 "use strict";
 
+var base = require('web_editor.base');
 var core = require('web.core');
 var _t = core._t;