fix whitespace

Author: ohmayr

gapic/templates/%namespace/%name_%version/%sub/services/%service/_shared_macros.j2

@@ -218,6 +218,7 @@ def _get_http_options():
         request_url = "{host}{uri}".format(host=self._host, uri=transcoded_request['uri'])
         method = transcoded_request['method']
         request_payload = {% if is_proto_plus_type %}type(request).to_json(request){% else %}json_format.MessageToJson(request){% endif %}
+
         http_request = {
           "payload": request_payload,
           "requestMethod": method,