See https://discourse.phabricator-community.org/t/unhandled-exception-when-logging-in-with-mfa/2828. The recent changes to turn msort() on a vector an error have smoked out a few more of these mistakes.

These cases do not meaningfully rely on sort stability so there's no real bug being fixed, but we'd still prefer msortv().

Viewed MFA and External Account settings panels. Did a git grep 'msort(' | grep -i vector for any more obvious callsites, but none turned up.