rP04b9f946020de32c513b69954933630641e8ff8f introduced isEditableByAdministrators() in src/applications/settings/panel/PhabricatorSettingsPanel.php.
In rP421bf2e548f06411a2ce86583333ec5e3e92c643, isEditableByAdministrators() was renamed to isManagementPanel().
Thus the addition of isEditableByAdministrators() to src/applications/settings/panel/PhabricatorEmailAddressesSettingsPanel.php in rPe0a3e6ba3b87f96c83905e7188bb6161f7480784 had no effect - that function has no callers anywhere in the codebase.
Fix that by using the correct function name.
Closes T16110