[FIX] hr_holidays: Skip validation rights if no validation

If validation type is set to `no_validation`, checking
if a target state is achievalbe should bypass
normal checks for the user's own leaves.
Otherwise, ir.rule raises an AccessError as the user
doesn't normally have the rights for leave in
state `validate`.

addons/hr_holidays/models/hr_leave.py

@@ -758,6 +758,8 @@ class HolidaysRequest(models.Model):
                     if holiday.employee_id != current_employee:
                         raise UserError(_('Only a Leave Manager can reset other people leaves.'))
                 else:
+                    if val_type == 'no_validation' and current_employee == holiday.employee_id:
+                        continue
                     # use ir.rule based first access check: department, members, ... (see security.xml)
                     holiday.check_access_rule('write')