event_change_undo

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Reverses the caller's own most recent change to a wedding or other personal event they host, restoring the value the detail had before it, through the same checks and into the same change log; each further call reverses the next older change of theirs. Needs a personal connector token and `eventIdOrName`. Only the hosts can use it, and only on changes they made themselves; an undo is not itself reversed. A change that gave a detail its first value, or no change left to reverse, answers NOTHING_TO_UNDO and changes nothing. When the event's Wallet passes are switched on, restoring a detail the pass shows updates every pass of the event and pushes the restored line to each phone that registered it. Returns the detail, the value before and after, a sentence for the person and, with passes on, `passNotice`.