Adds screen lock as a suggested activity

Also, fixes a bug where the suggested activity stayed on screen
after the component was disabled causing a crash.

bug:25246207
bug:26770556
Change-Id: I28d784cdc57e464e49887483690ab514ca3bc46a

src/com/android/settings/dashboard/DashboardSummary.java

@@ -161,6 +161,9 @@ public class DashboardSummary extends InstrumentedFragment
         List<DashboardCategory> categories =
                 ((SettingsActivity) getActivity()).getDashboardCategories();
         mAdapter.setCategories(categories);
+
+        // recheck to see if any suggestions have been changed.
+        mAdapter.setSuggestions(mSuggestionParser);
         mDashboard.setAdapter(mAdapter);
 
         long delta = System.currentTimeMillis() - start;