[IMP] website_quote: Notification 'viewed by customer' should be received by the responsible only

Currently some customers receive the automatic notification 'Quotation
viewed by customer'. This should not be the case as this notifciation
is purely internal and should only be sent to the quote responsible.

Notification is now a note with the responsible being directly in the
recipients.

addons/website_quote/controllers/main.py

@@ -23,7 +23,7 @@ class sale_quote(http.Controller):
             if Order and request.session.get('view_quote') != now:
                 request.session['view_quote'] = now
                 body = _('Quotation viewed by customer')
-                _message_post_helper(res_model='sale.order', res_id=Order.id, message=body, token=token, token_field="access_token", message_type='notification')
+                _message_post_helper(res_model='sale.order', res_id=Order.id, message=body, token=token, token_field="access_token", message_type='notification', subtype="mail.mt_note", partner_ids=Order.user_id.partner_id.ids)
         else:
             Order = request.env['sale.order'].search([('id', '=', order_id)])