Fix bug where screen would get stuck while panning

Bug: 3109113
diff --git a/src/com/android/launcher2/PagedView.java b/src/com/android/launcher2/PagedView.java
index abb9b0b..39a6af0 100644
--- a/src/com/android/launcher2/PagedView.java
+++ b/src/com/android/launcher2/PagedView.java
@@ -649,7 +649,7 @@
                  * otherwise don't.  mScroller.isFinished should be false when
                  * being flinged.
                  */
-                final int xDist = (mScroller.getFinalX() - mScroller.getCurrX());
+                final int xDist = Math.abs(mScroller.getFinalX() - mScroller.getCurrX());
                 final boolean finishedScrolling = (mScroller.isFinished() || xDist < mTouchSlop);
                 if (finishedScrolling) {
                     mTouchState = TOUCH_STATE_REST;