[DO NOT MERGE] 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
(cherry picked from commit 82ff64530e)

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

@@ -70,7 +70,6 @@ public class PortraitPagedViewHandler implements PagedOrientationHandler {
         out.halfPageSize = view.getNormalChildWidth() / 2;
         out.halfScreenSize = view.getMeasuredWidth() / 2;
         out.screenCenter = insets.left + view.getPaddingLeft() + out.scroll + out.halfPageSize;
-        out.pageParentScale = view.getScaleX();
     }
 
     @Override