Pass the correct hostname when using a proxy

The proxy doesn't modify the SNI request, so we need to pass the name of
the host we're trying to reach instead of the proxy we're reaching it
through.

lib/client.c

@@ -134,7 +134,7 @@ int lws_client_socket_service(struct libwebsocket_context *context,
 		if (wsi->use_ssl && !wsi->ssl) {
 #if defined(CYASSL_SNI_HOST_NAME) || defined(WOLFSSL_SNI_HOST_NAME) || defined(SSL_CTRL_SET_TLSEXT_HOSTNAME)
 			const char *hostname = lws_hdr_simple_ptr(wsi,
-						_WSI_TOKEN_CLIENT_PEER_ADDRESS);
+						_WSI_TOKEN_CLIENT_HOST);
 #endif
 
 			wsi->ssl = SSL_new(context->ssl_client_ctx);