crypto/tls: use inner hello for earlyData when using QUIC and ECH

I don't think we have good QUIC ECH tests. BoGo has some for this, but
I'm not sure how easy it would be to enable those for QUIC.

Fixes #76283

Change-Id: I0ffa535fd89a624b7f9bfd73441ce2a1683e0549
Reviewed-on: https://go-review.googlesource.com/c/go/+/720920
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Roland Shoemaker <roland@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>

handshake_client.go

@@ -309,7 +309,11 @@ func (c *Conn) clientHandshake(ctx context.Context) (err error) {
 	if hello.earlyData {
 		suite := cipherSuiteTLS13ByID(session.cipherSuite)
 		transcript := suite.hash.New()
-		if err := transcriptMsg(hello, transcript); err != nil {
+		transcriptHello := hello
+		if ech != nil {
+			transcriptHello = ech.innerHello
+		}
+		if err := transcriptMsg(transcriptHello, transcript); err != nil {
 			return err
 		}
 		earlyTrafficSecret := earlySecret.ClientEarlyTrafficSecret(transcript)