[IMP] hr_expense: less email notification on assignation

Managers were receiving 2 emails to say basically the same thing. This
commit removes one of those emails ("You have been assigned to ...").

closes odoo/odoo#39058

Taskid: 2067994
X-original-commit: 1dbffeb7dba9ed862d6c62ebd771e7581dd33250
Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

addons/hr_expense/models/hr_expense.py

@@ -746,7 +746,7 @@ class HrExpenseSheet(models.Model):
 
     @api.model
     def create(self, vals):
-        sheet = super(HrExpenseSheet, self.with_context(mail_create_nosubscribe=True)).create(vals)
+        sheet = super(HrExpenseSheet, self.with_context(mail_create_nosubscribe=True, mail_auto_subscribe_no_notify=True)).create(vals)
         sheet.activity_update()
         return sheet