message: fix(s2n-quic-events): correct tx error emission
  When a tx error occurs in the standard queue (used for recvfrom and
  sendto system call) we previously emitted an rx error. This commit
  corrects this, so now tx failures result in tx error events.
diff: @@ -109,7 +109,7 @@ impl<B: Buffer> Queue<B> {
  Err(err) => {
  entries.finish(count);
  - publisher.on_platform_rx_error(event::builder::PlatformRxError {
  + publisher.on_platform_tx_error(event::builder::PlatformTxError {
  errno: errno().0,
  });
  