Fix incorrect PublishHidServDescriptors value in logs

This code should say: "PublishHidServDescriptors is set to 0."

But it says:

  /* Let's avoid doing that if tor is configured to not publish. */
  if (!get_options()->PublishHidServDescriptors) {
    log_info(LD_REND, "Service %s not publishing descriptor. "
                      "PublishHidServDescriptors is set to 1.",
             safe_str_client(service->onion_address));
    goto end;
  }

I'll leave it to dgoulet and asn to fix, and decide how far it needs to be backported.

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