Prior to the change 4f809ffec69c the sizes are formated by humanize_number(3)
with flag HN_DECIMAL which displays the result using one decimal place
when is less than 10. Add the equivalent field modifier hn-decimal to
xo_emit() to restore the previous behavior.
Reported by: Mark Millard
Fixes: 4f809ffec69c gpart: add libxo support for "show" subcommand + man page updates
MFC after: 1 week