Notify as failed queued transfers upon logout
Notify as failed queued transfers upon logout

`SynchronousTransferListener` waits for the `onRequestFinish()` on every
transfer, including those that are discarded as result of a logout. This
commit emulates the start and failure of queued transfers, so no more
changes are needed.

meganz/sdk,meganz/sdk,meganz/sdk,Acidburn0zzz/sdk,Acidburn0zzz/sdk,meganz/sdk,Acidburn0zzz/sdk,Acidburn0zzz/sdk,Acidburn0zzz/sdk,meganz/sdk,Acidburn0zzz/sdk,meganz/sdk,Acidburn0zzz/sdk,meganz/sdk,Acidburn0zzz/sdk