Misc fixes to improve search

- Suppress one of results from "On lock screen"
- Remove screen title from sub sections in data usage screen.
- On UserSettins, index using resource instead raw. And build
  non-indexables using getNonIndexable and pref controlleres.

Change-Id: I947a97af60f1a08b237fda2f3c456cf1105b9231
Fixes: 74120518
Fixes: 74119743
Fixes: 74250251
Fixes: 74119687
Test: reindex