chore: remove debug print statement from newHelloPacket

Removed an unnecessary `fmt.Println` call that was used for debugging in the `newHelloPacket` method of `send.go` to clean up the console output.

Author: coadler

overlay/send.go

@@ -247,7 +247,6 @@ func (s *Send) newHelloPacket() []byte {
 		panic("marshal node: " + err.Error())
 	}
 
-	fmt.Println("sending", string(raw))
 	sealed := s.Auth.OverlayPrivateKey.SealTo(s.Auth.ReceiverPublicKey, raw)
 	return sealed
 }