Misc search summary text updates.

- Remove static text from default app summaries.They will be filled
dynamically at runtime, so we don't need the static ones here.
- Remove summaryOn/summaryOff strings from a few fragments. Search
framework does not need them.

Change-Id: I165766073ba70aceead88c3df02d62f3700e4592
Fix: 36474747
Fix: 34573952
Test: run existing tests