#10 Fixed gray background in timetable on days outside of given range

lib/model/timetable/timetableProps.dart

@@ -12,16 +12,6 @@ import '../../api/webuntis/queries/getTimetable/getTimetableResponse.dart';
 import '../../api/webuntis/webuntisError.dart';
 import '../dataHolder.dart';
 
-extension DateTimeExtension on DateTime {
-  DateTime jumpToNextWeekDay(int day) {
-    return add(
-      Duration(
-        days: (day - weekday) % DateTime.daysPerWeek,
-      ),
-    );
-  }
-}
-
 class TimetableProps extends DataHolder {
   final _queryWeek = DateTime.now().add(const Duration(days: 2));