isAllDay to legacy event object

src/models/event/EventInstance.ts

@@ -16,6 +16,7 @@ export default class EventInstance {
     let dateProfile = this.dateProfile
     let obj = this.def.toLegacy()
 
+    obj.isAllDay = dateProfile.isAllDay
     obj.start = dateEnv.toDate(dateProfile.unzonedRange.start)
     obj.end = dateProfile.hasEnd ?
       dateEnv.toDate(dateProfile.unzonedRange.end) :