__format_time: Force math scale to 0
__format_time: Force math scale to 0

Fish 3's new math builtin defaults to float output (with trailing 0s
removed), and modulo on things with a non-integer component retains
that component, i.e.

    math 3 % 2 # is 1
    math 3.5 % 2 # is 1.5 - the ".5" is just not touched

This requires fish 2.4.0, I'm not sure if anything else in pure does.

Alternatively, one could `string replace -r '\..*' ''` on every math
call here.

rafaelrinaldi/pure