Fix hh_mm_ss formatting for values >= 1 day

[Saalvage]

Summary of changes:

• Remove explicit assertion that prevents formatting hh_mm_sss >= 1 day
• Change hh_mm_ss' formatting implementation to use the hours and minutes explicitly (put_time does not deal with hours >= 24, which is desired behavior)
• Remove _Hh_mm_ss_part_underflow_to_zero and instead cast every duration to be formatted this way to hh_mm_ss directly (this is the format("{:%T}", some_duration) == "00:00:00" bug discussed in the original issue (not the same bug, but closely related ;))
• Simplified abs for durations slightly.
• Added custom %H format override.

Fixes #3676

[StephanTLavavej]

Thanks! I've pushed changes to fix hh_mm_ss's constructor (essentially going back to the main implementation, although I'm adding _Remove_duration_part<_CHRONO hours> to more closely follow the Standard) and fully update the expected results for 1.55f days, which allows all of the tests to pass.

[StephanTLavavej]

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

[StephanTLavavej]

Thanks for fixing this runtime correctness bug - oh happy day! 😹 📅 🎉