Fix yielding send_payment handling with timeout #958
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This PR fixes a bug that was introduced by #954 .
The bug caused
send_paymentto not return when no timeout was specified. Internally, this was caused by different behaviors ofstd::sync::mpsc::channel()thantokio::sync::oneshot::channel(). The later terminates and yields back control to the runtime when the spawned thread terminates, as expected.