Fix issue where extra page hangs around (issue 11634172)

Change-Id: Ia0900c9fc07bc587259e36ed17816eaf519b10dc

src/com/android/launcher3/Folder.java

@@ -758,6 +758,8 @@ public class Folder extends LinearLayout implements DragSource, View.OnClickList
                 }
                 completeDragExit();
             }
+        } else {
+            mLauncher.getWorkspace().removeExtraEmptyScreen(true, null);
         }
 
         mDeleteFolderOnDropCompleted = false;