[FIX] hr_contract: do not close contracts a day early

Steps to reproduce:
Launch a contract which has an end date
scheduled for the next day for an employee
and manually activate the "HR Contract: update state" cron.

Issue:
Running contracts are closed one day in advance.

Solution:
Correct the condition which selects contracts to close.

opw-3217616

closes odoo/odoo#116346

Signed-off-by: Kevin Baptiste <kba@odoo.com>