Enable time mismatch check

[rschaaf-aifa]

Time mismatch checks were disabled in 9a6a234 to avoid problems during tests in Xanten (no ptp or ntp server connected to ACU). Should be enabled again when ACU connected to time server. (The if construct should take care of it, but is unnecessary and hence confusing after 2024.)

[RonanHiggins]

Can we toggle this time check over the api? an alternative would be to set the ACU time via the OCS. I put together this python snippet that uses the ACU set time command that we could integrate into the OCS..

https://wiki.astro.uni-koeln.de/wikis/!ccatprime/doku.php?id=software:acu:acu#setting_time_via_python