Don't add the "Events" mode anymore, and delete it if disabled

Fixes: 368227085
Test: atest ZenModeHelperTest
Flag: android.app.modes_ui
Change-Id: Idd5563505ca92463485b433e80f29bf3e0f98d39

src/com/android/settings/notification/zen/ZenModeBackend.java

@@ -458,7 +458,7 @@ public class ZenModeBackend {
     }
 
     private static List<String> getDefaultRuleIds() {
-        return ZenModeConfig.DEFAULT_RULE_IDS;
+        return ZenModeConfig.getDefaultRuleIds();
     }
 
     NotificationManager.Policy toNotificationPolicy(ZenPolicy policy) {