Fix more "msort()" vs "msortv()" callsites

Summary:
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()`.

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

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D20587

src/applications/auth/engine/PhabricatorAuthSessionEngine.php

@@ -485,7 +485,7 @@ final class PhabricatorAuthSessionEngine extends Phobject {
     // change the order of prompts for users, but the alternative is that the
     // Settings panel order disagrees with the prompt order, which seems more
     // disruptive.
-    $factors = msort($factors, 'newSortVector');
+    $factors = msortv($factors, 'newSortVector');
 
     // If the account has no associated multi-factor auth, just issue a token
     // without putting the session into high security mode. This is generally

src/applications/settings/panel/PhabricatorExternalAccountsSettingsPanel.php

@@ -94,7 +94,7 @@ final class PhabricatorExternalAccountsSettingsPanel
       ->setViewer($viewer)
       ->withIsEnabled(true)
       ->execute();
-    $configs = msort($configs, 'getSortVector');
+    $configs = msortv($configs, 'getSortVector');
 
     $account_map = mgroup($accounts, 'getProviderConfigPHID');
 

src/applications/settings/panel/PhabricatorMultiFactorSettingsPanel.php

@@ -54,7 +54,7 @@ final class PhabricatorMultiFactorSettingsPanel
       ->setViewer($viewer)
       ->withUserPHIDs(array($user->getPHID()))
       ->execute();
-    $factors = msort($factors, 'newSortVector');
+    $factors = msortv($factors, 'newSortVector');
 
     $rows = array();
     $rowc = array();