Remove CurveProperties#pageParentScale

Test: Set TaskView#EDGE_SCALE_DOWN_FACTOR = 0.2f, then swipe
down on the centermost TaskView; ensure it fills the screen.
Alternatively, touch and hold the nav bar and ensure there is
no jump in scale on the app window.

Fixes: 169259407
Change-Id: Ib3cfba6ebafbcb90de9c6b1ab79f53605d995321

src/com/android/launcher3/touch/LandscapePagedViewHandler.java

@@ -72,7 +72,6 @@ public class LandscapePagedViewHandler implements PagedOrientationHandler {
         out.halfPageSize = view.getNormalChildHeight() / 2;
         out.halfScreenSize = view.getMeasuredHeight() / 2;
         out.screenCenter = insets.top + view.getPaddingTop() + out.scroll + out.halfPageSize;
-        out.pageParentScale = view.getScaleY();
     }
 
     @Override