Add workaround to handle overlay package changes for non-primary users

- Workaround for b/132825155, trigger the recreation of the sysui fragments
  as it would for normal users when overlays for secondary users change.

Bug: 132825155
Test: Enter secondary user, repeatedly try switching nav bar modes and
      ensure the buttons update correctly

Change-Id: Iec758014ed9941abcb270a12e84ec2db4ff23dd6