[FIX] sale_mrp: avoid creating useless picking

Steps to reproduce the bug:
- Install sale_management and sale_mrp
- Create a product with BOM, which is a KIT and add any product in BOM line
- Create a SO for the product > Confirm
- Validate the delivery
- Cancel the SO >  Set to Quotation > Reconfirm

Problem:
A new delivery order is generated while the ordered quantity = delivered quantity
This is because `_get_qty_procurement` wrongly computed the product quantity based on the moves quantities in the kit case.

opw-2647856

closes odoo/odoo#79387

Signed-off-by: William Henrotin (whe) <whe@odoo.com>