QUIC: fixed expected TLS codepoint with final draft and BoringSSL. A reasonable codepoint is always set[1] explicitly so that it doesn't depend on the default library value that may change[2] in the future. [1] https://boringssl.googlesource.com/boringssl/+/3d8b8c3d [2] https://boringssl.googlesource.com/boringssl/+/c47bfce0