[FIX] pos_restaurant: Order button should go green after unskip orderline

Expected behavior : The order button should go green and active when you 'unskipped' an orderline

Current behavior : The order button doesn't go green and can't be clicked when an orderline is 'unskipped'

Steps to reproduce the error :
First of all, you need to setup a PoS Restaurant with these options :
~ Bar/Restaurant
~ Enable `Table Management`
~ Enable and setup `Order Printer` with IP Address and choose Categories to be printed on.

1. Open a restaurant session
2. Pick a table
3. Select a product and put it on hold
4. Select the **same** product and order it
5. 'Unskipped' the product from step 3

Order button should be green and active but is unactive so the order can't be sent

Previously, the condition was only based on the product_id so error occurs when multiline of the same product are handled

opw-2557518

closes odoo/odoo#78829

X-original-commit: 8159e5ac
Signed-off-by: pimodoo <pimodoo@users.noreply.github.com>