Revert "close on failed low-TTL connects too"

This reverts commit 778d8752d2.

tcp_syni.nim

@@ -236,9 +236,9 @@ proc prepareAccept(attempt: AcceptAttempt) {.async.} =
       await connectFuture or sleepAsync(Timeout)
       if connectFuture.finished():
         echo "connected during accept phase"
+      sock.close()
     except OSError:
       discard
-    sock.close()
 
 proc doAccept(puncher: TcpSyniPuncher, srcIp: IpAddress,
               srcPort: Port) {.async.} =