Zoom-in wallpaper instead of zoom-out when unfolding

Fixes broken zoom-out effect when on unfolded screen.
It is caused by the unfold progress which is = 1.0f when
fully unfolded so the wallpaper always gets zoom-out level
equal to max(1f, [shade zoom/other zoom])).

Fixes: 202980082
Test: check that wallpaper zooms out on folded/unfolded screens
  pulling notification shade/opening all apps, when folding/unfolding
Test: atest com.android.systemui.unfold.UnfoldTransitionWallpaperControllerTest
Change-Id: I216739195818c3a385392d5a1172bd85939a039e