[Sns Logging] Fix chat transfer logging.

[ear-dev]

Shailesh thinks he found a spot that we missed when implementing the event.

[ear-dev]

NOTE: we are still seeing this issue after deploying the latest fix into production. It's quite likely I think that something else is going on during these mid chat transfers and that SF is not sending us the flag that we expect. We have enabled debug logging on SF responses, but at the moment it is not working in prod.

@ear-dev will set this up on our dev server and see if we can figure out why we're not seeing the logs.