remove non forward-secure dialing

This was broken for a long time, and won't be available when using the
TLS 1.3 handshake.

internal/handshake/crypto_setup_client.go

@@ -51,8 +51,8 @@ type cryptoSetupClient struct {
 	secureAEAD           crypto.AEAD
 	forwardSecureAEAD    crypto.AEAD
 
-	paramsChan  chan<- TransportParameters
-	aeadChanged chan<- protocol.EncryptionLevel
+	paramsChan     chan<- TransportParameters
+	handshakeEvent chan<- struct{}
 
 	params *TransportParameters
 }
@@ -74,7 +74,7 @@ func NewCryptoSetupClient(
 	tlsConfig *tls.Config,
 	params *TransportParameters,
 	paramsChan chan<- TransportParameters,
-	aeadChanged chan<- protocol.EncryptionLevel,
+	handshakeEvent chan<- struct{},
 	initialVersion protocol.VersionNumber,
 	negotiatedVersions []protocol.VersionNumber,
 ) (CryptoSetup, error) {
@@ -93,7 +93,7 @@ func NewCryptoSetupClient(
 		keyExchange:        getEphermalKEX,
 		nullAEAD:           nullAEAD,
 		paramsChan:         paramsChan,
-		aeadChanged:        aeadChanged,
+		handshakeEvent:     handshakeEvent,
 		initialVersion:     initialVersion,
 		negotiatedVersions: negotiatedVersions,
 		divNonceChan:       make(chan []byte),
@@ -159,8 +159,8 @@ func (h *cryptoSetupClient) HandleCryptoStream() error {
 			}
 			// blocks until the session has received the parameters
 			h.paramsChan <- *params
-			h.aeadChanged <- protocol.EncryptionForwardSecure
-			close(h.aeadChanged)
+			h.handshakeEvent <- struct{}{}
+			close(h.handshakeEvent)
 		default:
 			return qerr.InvalidCryptoMessageType
 		}
@@ -496,10 +496,8 @@ func (h *cryptoSetupClient) maybeUpgradeCrypto() error {
 		if err != nil {
 			return err
 		}
-
-		h.aeadChanged <- protocol.EncryptionSecure
+		h.handshakeEvent <- struct{}{}
 	}
-
 	return nil
 }