[FIX] sale: don't assign non-salesperson as salesperson on sales order

Before this commit, if you create a sale order for partner who is not
is not a salesman on the res.partner, you become the salesman of the
sale.order. No matter if you are salesman or even employee.

After this commit, the customer or public user will be not assigned as a
salesman on sale.order when creating without forcing the user_id = False.

closes odoo/odoo#110486

X-original-commit: 008cd34c49574f1b0c50132a75b50111422e431a
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

addons/sale/models/sale_order.py

@@ -421,7 +421,8 @@ class SaleOrder(models.Model):
     def _compute_user_id(self):
         for order in self:
             if not order.user_id:
-                order.user_id = order.partner_id.user_id or order.partner_id.commercial_partner_id.user_id or self.env.user
+                order.user_id = order.partner_id.user_id or order.partner_id.commercial_partner_id.user_id or \
+                    (self.user_has_groups('sales_team.group_sale_salesman') and self.env.user)
 
     @api.depends('partner_id', 'user_id')
     def _compute_team_id(self):