Clear any custom display name used for this application instance.

💾 This method alters the persisted account state.

This method clears the name of the current application's device record, causing other applications or the user's account management pages to have to fill in some sort of default name when displaying this device.

Notes

- Device registration is only available to applications that have been
  granted the `https:///identity.mozilla.com/apps/oldsync` scope.