timesync: When timesync is run by cron (/usr/local/bin/htpdate_hourly),
and there is nothing important to tell, say nothing. Otherwise there
would be such a popup every hour.
whonix_shared/etc/profile.d/10_timesync.sh; whonix_shared/etc/profile.d/20_whonixcheck.sh:
No longer use return, because it doesn't work.