[FIX] hr_org_chart: Avoid write on employee just by loading the view

Before this commit:
When loading a employee form, a write is done due to hr_org_chart

After this commit:
No write should be performed

closes odoo/odoo#41958

Taskid: 2150314
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

addons/hr_org_chart/models/hr_org_chart_mixin.py

@@ -28,7 +28,6 @@ class HrEmployeeBase(models.AbstractModel):
         direct_subordinates = self.child_ids - parents
         for child in direct_subordinates:
             child_subordinate = child._get_subordinates(parents=parents)
-            child.subordinate_ids = child_subordinate
             indirect_subordinates |= child_subordinate
         return indirect_subordinates | direct_subordinates