If the AI shunts while the doomsday flufftext proc is activating, the doomsday will now revert to idle. It can be re-activated if and when the AI returns to their core. A fully activated doomsday event (when the crew is given a delta alert) will still be properly disabled if the AI shunts, and cannot be reactivated. Closes#56785
Also fixes the name of the doomsday flufftext proc, which was arguably the bigger issue.
Finally, adds an admin message, sent when the AI starts the flufftext proc.
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