Design refresh for modes that don't filter notifications

And fix a crash noticed in ZenModeAppsLinkPreferenceController

Test: atest com/android/settings/notification/modes
Fixes: 308820027
Flag: android.app.modes_ui
Change-Id: I0cfe4e10ca7ff97dac3b3b8756cc36f4d6f91ea2

src/com/android/settings/notification/modes/ZenModeFragment.java

@@ -53,6 +53,8 @@ public class ZenModeFragment extends ZenModeFragmentBase {
                 context, "mode_display_settings", mBackend, mHelperBackend));
         prefControllers.add(new ZenModeSetTriggerLinkPreferenceController(context,
                 "zen_automatic_trigger_category", this, mBackend));
+        prefControllers.add(new InterruptionFilterPreferenceController(
+                context, "allow_filtering", mBackend));
         return prefControllers;
     }