[FIX] account: unlink moves lines in batch

To reproduce performance problem one can use following scenario:

* Use Enterprise v13
* go to Accounting / Assets, select the chair and click on "Set To Running"
* Click "Modify Deprecation" and enter the following values:
Reason: x
Number of Deprecations: 1000 Months
Deprecation Amount: 1000
Account Asset Counterpart: 101000 Current Assets
* click on "Modify"

---

opw-2621292

closes odoo/odoo#75919

Signed-off-by: William André (wan) <wan@odoo.com>