<chrono>: Fix hh_mm_ss subsecond formatting for floats #1866
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Before, the same formatting string was used for floats and integrals.
This meant that large floats were formatted using exponent notaion and
small floats were not, and it also meant there was an extra period in a
time, as the subseconds could be fractions of a subsecond (say .4
nanoseconds). Now if the subseconds are floats, we force fixed
formatting to get the right number of leading zeroes and a precision of
0 to round off fractions of subseconds.