Commit 21cfba66fd recreated a holder's missing MPToken as authorized
for both pool assets. On a cross-issuer MPT/MPT pool this let one
issuer's clawback re-authorize the holder for the *other* issuer's
asset, bypassing its lsfMPTRequireAuth. Only auto-authorize the
recreated MPToken for the clawback issuer's own asset; recreate the
paired asset unauthorized.