Consolidate all the dividers to provide same look and feel

Bug: 30017936
Change-Id: I072cb116dba1df555a63f3f67b730f7f9c3a235a
diff --git a/src/com/android/launcher3/BaseRecyclerView.java b/src/com/android/launcher3/BaseRecyclerView.java
index f8ef1e1..4cb050e 100644
--- a/src/com/android/launcher3/BaseRecyclerView.java
+++ b/src/com/android/launcher3/BaseRecyclerView.java
@@ -264,7 +264,7 @@
         // Calculate the current scroll position, the scrollY of the recycler view accounts for the
         // view padding, while the scrollBarY is drawn right up to the background padding (ignoring
         // padding)
-        int scrollY = getScrollTop(scrollPosState);
+        int scrollY = Math.max(0, getScrollTop(scrollPosState));
         int scrollBarY = mBackgroundPadding.top +
                 (int) (((float) scrollY / availableScrollHeight) * availableScrollBarHeight);