Cancel drag in DragLayout if pointer is invalid.

Test: Verify that regular drags/flings still work.
Fixes: 34822153

Change-Id: I61c4ee3904793a8253406a18c06d314dedf29b63
diff --git a/src/com/android/calculator2/HistoryFragment.java b/src/com/android/calculator2/HistoryFragment.java
index 6847cc9..109d8fc 100644
--- a/src/com/android/calculator2/HistoryFragment.java
+++ b/src/com/android/calculator2/HistoryFragment.java
@@ -159,7 +159,7 @@
         super.onStart();
 
         final Calculator activity = (Calculator) getActivity();
-        mDragController.initializeAnimation(activity.isResultLayout(), activity.isOneLine(), 
+        mDragController.initializeAnimation(activity.isResultLayout(), activity.isOneLine(),
                 mIsDisplayEmpty);
     }