libwebsockets

client: awaiting header is only a CCE for ws

In the case http client doesn't get a response and closes, currently
it is confused, it reports it as a CLIENT_CONNECTION_ERROR but then
also a CLOSED_CLIENT_HTTP.

Adapt the logic so we only go that way for ws connection... not getting
the server headers means not reaching ESTABLISHED, which makes it a
CCE not a CLOSE.

Also make sure we never issue a CLOSE type callback if we issued a CCE.