Use the public methods for setting rampup/rampdown time

Starting these at 0; default is 500

Change-Id: I1e097bc72d341bdd0ef73c9e9c43a8c37fe76bf9
diff --git a/src/com/android/launcher3/FolderAutoScrollHelper.java b/src/com/android/launcher3/FolderAutoScrollHelper.java
index 68edc60..3c2b449 100644
--- a/src/com/android/launcher3/FolderAutoScrollHelper.java
+++ b/src/com/android/launcher3/FolderAutoScrollHelper.java
@@ -36,6 +36,8 @@
         setEdgeType(EDGE_TYPE_INSIDE_EXTEND);
         setExclusive(true);
         setMaximumVelocity(MAX_SCROLL_VELOCITY, MAX_SCROLL_VELOCITY);
+        setRampDownDuration(0);
+        setRampUpDuration(0);
     }
 
     @Override