message: fix http2 server header name truncate error
diff: @@ -178,7 +178,7 @@ static int http2_build_header(http_context *ctx, uchar *buffer, int body_length
  {
  flag |= HTTP_RESPONSE_CONTENT_TYPE;
  }
  - http2_add_header(&nv[index++], key, keylen - 1, Z_STRVAL_P(value), Z_STRLEN_P(value));
  + http2_add_header(&nv[index++], key, keylen, Z_STRVAL_P(value), Z_STRLEN_P(value));
  }
  SW_HASHTABLE_FOREACH_END();
  (void)type;
  