[FIX] hr_holidays_attendance: not blocking the refusal of leave

Steps to reproduce:
-------------------
- activate "Count Extra Hours" in Attendances settings;
- create attendances for an employee to create an overtime
(select one day of the weekend for example);
- create an Extra Hours type leave for this employee;
- remove the attendance that creates extra hours;

The extra hours of the employee is negative

- refuse the leave created before;

Issue:
------
A Validation Error occurs with the message:
"The employee does not have enough extra hours to extend this leave.".

Solution:
---------
Refuse leave based on extra hours
should not require any control
because we are not trying to extend leave.

opw-3342778

closes odoo/odoo#124219

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

addons/hr_holidays_attendance/models/hr_leave.py

@@ -36,6 +36,9 @@ class HRLeave(models.Model):
             self._check_overtime_deductible(self)
         #User may not have access to overtime_id field
         for leave in self.sudo().filtered('overtime_id'):
+            # It must always be possible to refuse leave based on overtime
+            if vals.get('state') in ['refuse']:
+                continue
             employee = leave.employee_id
             duration = leave.number_of_hours_display
             overtime_duration = leave.overtime_id.sudo().duration