Adding missing ADD_ONs. (But there are more.)

astrid/plugin-src/com/todoroo/astrid/tags/TagFilterExposer.java

@@ -133,6 +133,7 @@ public class TagFilterExposer extends BroadcastReceiver {
         // transmit filter list
         Intent broadcastIntent = new Intent(AstridApiConstants.BROADCAST_SEND_FILTERS);
         broadcastIntent.putExtra(AstridApiConstants.EXTRAS_RESPONSE, list);
+        broadcastIntent.putExtra(AstridApiConstants.EXTRAS_ADDON, TagsPlugin.IDENTIFIER);
         context.sendBroadcast(broadcastIntent, AstridApiConstants.PERMISSION_READ);
     }