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Before, only replies to chat messages were moved to the mvbox because we're removing Chat-Version from outer headers, but there's no much sense in moving only replies and not moving original messages and MDNs. Instead, move all encrypted messages. Users should be informed about this in UIs, so if a user has another PGP-capable MUA, probably they should disable MvboxMove. Moreover, untying this logic from References and In-Reply-To allows to remove them from outer headers too, the "Header Protection for Cryptographically Protected Email" RFC even suggests such a behavior: https://datatracker.ietf.org/doc/html/rfc9788#name-offering-more-ambitious-hea.