Fix bug #13928293 Search - remove "switchTextOn" / "switchTextOff" from indexing

- remove all related code
- update the Index database schema and its version

Change-Id: Iaa5219b77efe5db3a404708663fdf82f10d043d3

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

@@ -32,8 +32,6 @@ public class SearchIndexableRaw extends SearchIndexableData {
     public String summaryOn;
     public String summaryOff;
     public String entries;
-    public String switchOn;
-    public String switchOff;
     public String keywords;
 
     public String screenTitle;