remove unused handshakeComplete member variable from sent packet handler

internal/ackhandler/sent_packet_handler.go

@@ -59,8 +59,7 @@ type sentPacketHandler struct {
 	congestion congestion.SendAlgorithmWithDebugInfos
 	rttStats   *congestion.RTTStats
 
-	handshakeComplete bool
-	maxAckDelay       time.Duration
+	maxAckDelay time.Duration
 
 	// The number of times the crypto packets have been retransmitted without receiving an ack.
 	cryptoCount uint32
@@ -125,7 +124,6 @@ func (h *sentPacketHandler) SetHandshakeComplete() {
 		}
 	}
 	h.retransmissionQueue = queue
-	h.handshakeComplete = true
 }
 
 func (h *sentPacketHandler) SetMaxAckDelay(mad time.Duration) {

internal/ackhandler/sent_packet_handler_test.go

@@ -808,10 +808,6 @@ var _ = Describe("SentPacketHandler", func() {
 	})
 
 	Context("crypto packets", func() {
-		BeforeEach(func() {
-			handler.handshakeComplete = false
-		})
-
 		It("detects the crypto timeout", func() {
 			now := time.Now()
 			sendTime := now.Add(-time.Minute)