[FIX] hr_holidays : Only request both approval for employee request

Current behaviour :
When creating a leave type with both approval required for allocation and then setting allocation to 'Set by time off officer', we still require 2 approvals.

Behaviour after PR :
Leave type with allocation set to 'Set by time off officer' will only require one approval as expected.

opw-2671540

closes odoo/odoo#79718

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

addons/hr_holidays/models/hr_leave_allocation.py

@@ -300,7 +300,7 @@ class HolidaysAllocation(models.Model):
     def _compute_can_approve(self):
         for allocation in self:
             try:
-                if allocation.state == 'confirm' and allocation.validation_type == 'both':
+                if allocation.state == 'confirm' and allocation.holiday_status_id.allocation_type == "fixed_allocation" and allocation.validation_type == 'both':
                     allocation._check_approval_update('validate1')
                 else:
                     allocation._check_approval_update('validate')