[FIX] hr_contract: allow to close employee's contracts
[FIX] hr_contract: allow to close employee's contracts

- There's a constraint limiting the number of contracts an employee can
have.

This constraint take in account closed contract which cause issues.
For example if you have to sign a new contract for an employee with a
running contract, you'll have to close the current running contract.
But if this employee already has closed contracts, you won't be able
to close it since they are detected as ""running"" contracts.

closes odoo/odoo#33294

Signed-off-by: Toufik Benjaa (tbe) <c6f81aa4457266a65463c97406f59c8b81e8d7de@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo