[FIX] website_sale_comparison: archived (or deleted) products

Archived or deleted products shouldn't be counted in the comparison
widget count anymore.

The current behavior did only reset the cookie (and the count) when
products were added/removed from the comparison, but didn't consider
the case when the products currently in the cookie weren't all existing/valid.

Fixes #44049

closes odoo/odoo#44485

X-original-commit: 0b488842c0be2160c5ccd3b5b03b02a728f4eec5
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

addons/website_sale_comparison/static/src/js/website_sale_comparison.js

@@ -145,6 +145,13 @@ var ProductComparison = publicWidget.Widget.extend(VariantMixin, {
             _.each(data, function (product) {
                 self.product_data[product.product.id] = product;
             });
+            if (product_ids.length > Object.keys(data).length) {
+                /* If some products have been archived
+                they are not displayed but the count & cookie
+                need to be updated.
+                */
+                self._updateCookie();
+            }
         });
     },
     /**