Actually count number of bytes sent in protocol handshake

Author: shs96c

java/client/src/org/openqa/selenium/remote/ProtocolHandshake.java

@@ -63,7 +63,7 @@ public Result createSession(HttpClient client, Command command)
     FileBackedOutputStream os = new FileBackedOutputStream(threshold);
     try (
         CountingOutputStream counter = new CountingOutputStream(os);
-        Writer writer = new OutputStreamWriter(os, UTF_8);
+        Writer writer = new OutputStreamWriter(counter, UTF_8);
         NewSessionPayload payload = NewSessionPayload.create(desired)) {
 
       payload.writeTo(writer);