PhabricatorEmailPreferencesSettingsPanel::getAllEditorsWithTags() queries for all classes extending PhabricatorApplicationTransactionEditor and having getMailTagsMap() to then pull their editor application class. Thus return the correct editor application class.
Followup to rP821708414e.

grep -r "('PhabricatorApplicationTransactionEditor'" . shows only a single result in the Phorge codebase (this PhutilClassMapQuery->setAncestorClass('PhabricatorApplicationTransactionEditor') call) so I assume there will be no unwanted side effects.

Closes T16002

• Uninstall Audit on /applications/view/PhabricatorAuditApplication/
• Check for Audits section on /settings/panel/emailpreferences/
• Re-install Audit and try random actions on a commit like: Accept commit, Raise a concern, Change Project Tags, award token, Subscribe, Unsubscribe, Resign as Auditor, no regressions