declare peer id as signed integer

[42milez]

In the code below, since receiver_id is declared as uint32_t, this block will be never activated.

network.cc: 325

else if (receiver_id < 0) {
    for (const auto &[id, peer] : peers_) {
        // do not resend to self, also do not send to excluded
        if (id == sender_id || id == -receiver_id) {
            continue;
        }

        peer->Send(event->Channel(), payload.segment, nullptr);
    }

    if (-receiver_id != 1) {
        payloads_.push_back(payload);
    }
}