Avoid some reinflations when unfolding

The reason why views were reinflated onSmallestScreenWidthChanged is that the userSwitcher could have been visible in one configuration, but invisible in another.

With this change, views are reinflated only if it is sure there is a visibility change of the user switcher.

From Perfetto recordings, this makes the screen switch (from external to internal) 95ms faster

Bug: 197515205
Bug: 186728895
Test: Manually tested
Change-Id: Ic887c3727a9bf911861078af72dc642621f6076e