message: Fix type-o in to_stream duration overload.
diff: @@ -5128,7 +5128,7 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
  {
  using Duration = std::chrono::duration<Rep, Period>;
  using CT = typename std::common_type<Duration, std::chrono::seconds>::type;
  - fields<Duration> fds{time_of_day<CT>{d}};
  + fields<CT> fds{time_of_day<CT>{d}};
  to_stream(os, fmt, fds);
  }
  