Fix issue about at which time Bluetooth devices name are indexed

- remembered devices name were only indexed when BT was turned on/off
- allow the same when they are paired
- remove device name from the Index if it is un-paired

Change-Id: I1206a591b0132789c3b003e52c7ffac630e80758

src/com/android/settings/search/Index.java

@@ -239,8 +239,9 @@ public class Index {
         return result;
     }
 
-    private boolean updateFromSearchIndexableData(SearchIndexableData data) {
+    public boolean updateFromSearchIndexableData(SearchIndexableData data) {
         addIndexableData(data);
+        mDataToProcess.forceUpdate = true;
         return updateInternal();
     }