Remove captains ability to roll antag

[Mouse]

Perhaps have Centcomm make an announcement ~20 minutes or so into the round if there's an antag captain saying something along the lines of "while our vetting process is rigorous and far higher than required by space law, any system will inevitably produce false negatives and as such it is with regret that we inform the crew that the ranking commander of the station may have been compromised".

I dunno, just an idle thought.