Use MainSwitchPreference on Bubbles, Screen Saver and

One-Handed mode pages.

Fixes: 178679876
Fixes: 177968619
Test: robotest and see the UIs.
Change-Id: Ic62c7464a71e5410ece5d1db7578c522e1babedc

src/com/android/settings/dream/DreamSettings.java

@@ -129,9 +129,8 @@ public class DreamSettings extends DashboardFragment {
     }
 
     private static List<AbstractPreferenceController> buildPreferenceControllers(Context context) {
-        List<AbstractPreferenceController> controllers = new ArrayList<>();
+        final List<AbstractPreferenceController> controllers = new ArrayList<>();
         controllers.add(new WhenToDreamPreferenceController(context));
-        controllers.add(new StartNowPreferenceController(context));
         return controllers;
     }