Hide "Factory reset" item for secondary users

Bug: 35415714
Test: make RunSettingsRoboTests
Change-Id: I48d6d094476c5fc83dbc17906d84cc848e499624

src/com/android/settings/system/SystemDashboardFragment.java

@@ -62,6 +62,7 @@ public class SystemDashboardFragment extends DashboardFragment {
         final List<PreferenceController> controllers = new ArrayList<>();
         controllers.add(new SystemUpdatePreferenceController(context, UserManager.get(context)));
         controllers.add(new AdditionalSystemUpdatePreferenceController(context));
+        controllers.add(new FactoryResetPreferenceController(context, UserManager.get(context)));
         return controllers;
     }