Just always uses BytseIO in text_format for now

Signed-off-by: Dan O'Reilly <oreilldf@gmail.com>

python/google/protobuf/text_format.py

@@ -92,10 +92,7 @@ def MessageToString(message, as_utf8=False, as_one_line=False,
   Returns:
     A string of the text formatted protocol buffer message.
   """
-  if as_utf8:
-    out = io.BytesIO()
-  else:
-    out = io.BytesIO()
+  out = io.BytesIO()
   PrintMessage(message, out, as_utf8=as_utf8, as_one_line=as_one_line,
                pointy_brackets=pointy_brackets,
                use_index_order=use_index_order,