Fix for regression in WindowManager orientation changes

A fix yesterday for #7428221 caused a regression where new orientations would
sometimes cause a flash through black on the way to seeing the real static wallpaper.
There is a fundamental problem in WindowManagerService where we show a window before
it has all of the layout/sizing information it needs, which is the cause of the black
flash. The regression yesterday was that we are now less aggressive about layout out
hidden windows, so we won't layout the window until after the window is shown with the
incorrect sizing info.

The fix/workaround is to back off the layout logic specifically for the wallpaper,
ensuring that we will lay it out on orientation changes, even when hidden. This means that
when we finally do show it, it will already have been drawn in the correct orientation/size.

Issue #7444971 Home jank regression

Change-Id: Ib20fdabc43ece9720b261bf04b272c5511e2d902