[FIX] account,point_of_sale: payment reconciliation line order

Create 3 invoices for customer (A: $100, B: $300, C: $200)
Have a customer payment of $500
Reconcile the payment, in the widget add the line in the order:
- Payment line
- Invoice A
- Invoice B
- Invoice C (partial payment)
Reconcile
Check invoices

Issue:
C will be fully paid, the partial payment will be applied to B
After 5b2c1d24
We order the lines by amount currency but the user provided order is
lost. Moving the original fix to point of sale

opw-3240586

closes odoo/odoo#119477

Related: odoo/enterprise#40173
Signed-off-by: William André (wan) <wan@odoo.com>