Fixed header elevation shadow on rotate

Change-Id: I1a4b55cf9af67d93e56d84378036c0061b6e8104

src/com/android/launcher3/widget/WidgetsRecyclerView.java

@@ -129,7 +129,7 @@ public class WidgetsRecyclerView extends BaseRecyclerView {
     }
 
     @Override
-    protected int getCurrentScrollY() {
+    public int getCurrentScrollY() {
         // Skip early if widgets are not bound.
         if (isModelNotReady() || getChildCount() == 0) {
             return -1;