Make the fragment title can’t searchable

we shouldn't take users so deep into the settings IA because it's easy
to feel lost in settings after clicking on a result without additional
context.

Bug: 143055215
Test: robotest & manual
Change-Id: I337cb5ead31e1e4e7bf9be78132e90630f83ee43

src/com/android/settings/network/TopLevelNetworkEntryPreferenceController.java

@@ -46,7 +46,7 @@ public class TopLevelNetworkEntryPreferenceController extends BasePreferenceCont
 
     @Override
     public int getAvailabilityStatus() {
-        return Utils.isDemoUser(mContext) ? UNSUPPORTED_ON_DEVICE : AVAILABLE_UNSEARCHABLE;
+        return Utils.isDemoUser(mContext) ? UNSUPPORTED_ON_DEVICE : AVAILABLE;
     }
 
     @Override