Restore divider between app predictions and apps

Screenshot: https://screenshot.googleplex.com/89jJLU3JXV8tRXM
Bug: 180017741
Test: Manual
Change-Id: Iab1764fe94340f120770054cf5a59bd3ed9e45a4

src/com/android/launcher3/allapps/AllAppsContainerView.java

@@ -757,6 +757,7 @@ public class AllAppsContainerView extends SpringRelativeLayout implements DragSo
                 int bottomOffset = mWorkModeSwitch != null && mIsWork ? switchH : 0;
                 recyclerView.setPadding(padding.left, padding.top, padding.right,
                         padding.bottom + bottomOffset);
+                recyclerView.scrollToTop();
             }
         }