fix: (minor) build issues on cart and item page

- Move `cart.js` to public/js directory
- Reorder import sequence in erpnext web bundle
- Removed unused script block

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

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