Clear the draginfo object once the item is dropped inside a folder

issue: 16097189

Change-Id: I187b5ac97ecb5204040962e7b707ef2a2f022306
diff --git a/src/com/android/launcher3/Folder.java b/src/com/android/launcher3/Folder.java
index 6bd4e0e..a27e519 100644
--- a/src/com/android/launcher3/Folder.java
+++ b/src/com/android/launcher3/Folder.java
@@ -1295,6 +1295,8 @@
         mSuppressOnAdd = true;
         mInfo.add(si);
         mSuppressOnAdd = false;
+        // Clear the drag info, as it is no longer being dragged.
+        mCurrentDragInfo = null;
     }
 
     // This is used so the item doesn't immediately appear in the folder when added. In one case