[FIX] mrp: can't open workorders from mrp overview

How to reproduce:
- Install mrp & mrp_workorder;
- Open Manufacturing and plan a workorder;
- Go on the Work Centers Overview;
- Click on "WORK ORDERS" button -> You got a "Something went wrong !".

closes odoo/odoo#35900

Signed-off-by: Simon Lejeune (sle) <sle@openerp.com>