Bug#567246: procps: watch -n doesn't longer support float numbers

[Гузанов Даниил]

watch -n 0.5 ps
Usage: watch [-bdhnptvx] [--beep] [--differences[=cumulative]] [--exec]
[--help] [--interval=<n>] [--no-title] [--version] <command>

`watch -n 0,5` works correctly.