changed to correct alarm type

lib/pages/task_edit_page.dart

@@ -268,9 +268,8 @@ class _TaskEditPageState extends State<TaskEditPage> {
         alarmRequests.add(CreateLocationAlarmRequest());
       case AlarmType.timeFixed:
         alarmRequests.add(CreateFixedTimeAlarmRequest());
-
       case AlarmType.timeRelative:
-        alarmRequests.add(CreateFixedTimeAlarmRequest());
+        alarmRequests.add(CreateRelativeTimeAlarmRequest());
     }
     setState(() {});
   }