Running Cadence in Garmin FIT use "fractional_cadence" with float

[MaksVasilev]

In Garmin FIT files for Running metrics use 2 field for Cadence:

    [field id=4] cadence 79 rpm
    [field id=53] fractional_cadence 0.5 rpm

This record in Garmin show as 159 spm ( (79 + 0.5 rpm) x 2)

But in GC i see only integer "79" in "Edit" mode.

FIT file: https://github.com/MaksVasilev/fit2gpx/blob/44a0e45fbdc12839899d460825fc5866fba0229e/test/68MK1405.FIT?raw=true

Dump of this FIT file: https://github.com/MaksVasilev/fit2gpx/blob/44a0e45fbdc12839899d460825fc5866fba0229e/test/68MK1405.FIT.dump

Activity in Garmin Connect: https://connect.garmin.com/modern/activity/1316823498

[grauser]

fix in commit 00e3e13