Settings: Migrate zen event conditions to use calendar name.

And make sure any existing calendar value always appears in the
picker, even before it exists in the calendar provider.

Bug: 17755700
Change-Id: I8aa298a0d5804c288e2596f18c2dc7318f752121

src/com/android/settings/notification/ZenRuleNameDialog.java

@@ -165,7 +165,7 @@ public abstract class ZenRuleNameDialog {
 
     private static RuleInfo defaultNewEvent() {
         final EventInfo event = new EventInfo();
-        event.calendar = EventInfo.ANY_CALENDAR;
+        event.calendar = null; // any calendar
         event.reply = EventInfo.REPLY_ANY_EXCEPT_NO;
         final RuleInfo rt = new RuleInfo();
         rt.settingsAction = ZenModeEventRuleSettings.ACTION;