never allow 0-RTT when using Dial, even if the session ticket allows it (#4125)

When resuming a TLS session using Dial (and not DialEarly), 0-RTT should
be disabled at the TLS layer, even if the session ticket allows for
0-RTT resumption.

This bug is not critical, since Dial doesn't return an EarlyConnection,
so the client wouldn't be able to actually send 0-RTT data in practice.

internal/qtls/client_session_cache_test.go

@@ -41,7 +41,10 @@ var _ = Describe("Client Session Cache", func() {
 			ClientSessionCache: &clientSessionCache{
 				wrapped: tls.NewLRUClientSessionCache(10),
 				getData: func() []byte { return []byte("session") },
-				setData: func(data []byte) { restored <- data },
+				setData: func(data []byte) bool {
+					restored <- data
+					return true
+				},
 			},
 		}
 		conn, err := tls.Dial(