Fixing bugs with new widget adding

-> widget ids were being reused in some cases
-> widgets could be added before springloaded mode was entered

Change-Id: Iaf3bffc49d4ec2de4b63db1b5cfb52b8544e9c2b
diff --git a/src/com/android/launcher2/Launcher.java b/src/com/android/launcher2/Launcher.java
index 708d5d6..4062145 100644
--- a/src/com/android/launcher2/Launcher.java
+++ b/src/com/android/launcher2/Launcher.java
@@ -582,6 +582,7 @@
         mWorkspace.animateExternalDrop(mWidgetBeingConfigured, cellLayout,
                 (DragView) mDragLayer.getAnimatedView(), onCompleteRunnable,
                 animationType);
+        mWidgetBeingConfigured = null;
     }
 
     @Override