fix: Cart buttons not working

- Add cart.js to web bundle
- Hide icon conditionally since now this file loads on every single page

erpnext/public/js/erpnext-web.bundle.js

@@ -1,6 +1,7 @@
 import "./website_utils";
 import "./wishlist";
 import "./shopping_cart";
+import "./cart";
 import "./customer_reviews";
 import "../../e_commerce/product_ui/list";
 import "../../e_commerce/product_ui/views";