Fix hardcoded constant when polling for timetable, so teachers can get their timetable too

lib/api/webuntis/queries/getTimetable/getTimetableCache.dart

@@ -26,7 +26,7 @@ class GetTimetableCache extends RequestCache<GetTimetableResponse> {
             options: GetTimetableParamsOptions(
                 element: GetTimetableParamsOptionsElement(
                     id: (await Authenticate.getSession()).personId,
-                type: 5,
+                type: (await Authenticate.getSession()).personType,
                 keyType: GetTimetableParamsOptionsElementKeyType.id,
             ),
             startDate: startdate,