[FIX] purchase,sale: Packaging Quantity field missing on mobile

Steps to reproduce
==================

- Use a mobile viewport
- Create a quotation
- Add an order line
- Set a packaging
-> The Packaging Quantity field is missing

The same happens on purchase orders

---

opw-3504829

closes odoo/odoo#136163

X-original-commit: c5d665cc2b43a0040c3f5644265e74048c3d5ded
Signed-off-by: Tiffany Chang (tic) <tic@odoo.com>
Signed-off-by: Hubert Van De Walle <huvw@odoo.com>