[ldk-net] Correct pollfds array offset after reads #74
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Previously, we were copying the pollfds array at an offset of one
into the handler thread's stack. However, when it was changed to
copying at a 0 offset (adding the pipe read fd at the end instead
of beginning), the disable-read handling code was not updated.
This leads to an assertion failure at runtime if LDK decides we
need to stop reading due to the outbound buffer of a peer being
full.