[FIX] hr_expense: correctly set address_id for restricted user

New rights were applied on hr.employee with this commit https://github.com/odoo/odoo/commit/2d777d5ade94f4a80862608e2807660f289d9923

Since, users with limited rights would see a read error when submitting an
expense to manager.
Indeed, when clicking on "SUBMIT TO MANAGER", it opens the view form for
'hr.expense.sheet' that trigger an onchange on employee_id to set the
employee's private address to the expense.
Since restricted users can't read that field, the rpc call to that onchange
was throwing an error resulting in:
1. Showing an read error when entering form view that user could close to
   save anyway.
2. The hr.expense.sheet address would not be set as it should have

Now, we give sudo rights to read that field during the onchange

OPW-815786

addons/hr_expense/models/hr_expense.py

@@ -512,7 +512,7 @@ class HrExpenseSheet(models.Model):
 
     @api.onchange('employee_id')
     def _onchange_employee_id(self):
-        self.address_id = self.employee_id.address_home_id
+        self.address_id = self.employee_id.sudo().address_home_id
         self.department_id = self.employee_id.department_id
 
     @api.one