Add method for adding expansion listener without firing event

The current method immediately sends a change event to the listener,
which causes the AuthDialogPanelInteractionDetector dialog to
immediately cancel itself upon adding the listener. Adding a new
method that doesn't fire the event and calling that instead fixes
the problem.

Test: manually verified
Test: atest SystemUITests SystemUIGoogleTests
Fixes: 278455611
Change-Id: Id94bba0ab10890fd3c380d69cf6409c614c7e84c