Made timetable zoom persistent

lib/storage/base/settings.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:json_annotation/json_annotation.dart';
 
 import '../gradeAverages/gradeAveragesSettings.dart';
+import '../timetable/timetableSettings.dart';
 
 part 'settings.g.dart';
 
@@ -15,11 +16,13 @@ class Settings {
   bool devToolsEnabled;
 
   GradeAveragesSettings gradeAveragesSettings;
+  TimetableSettings timetableSettings;
 
   Settings({
     required this.appTheme,
     required this.devToolsEnabled,
-    required this.gradeAveragesSettings
+    required this.gradeAveragesSettings,
+    required this.timetableSettings
   });
 
   static String _themeToJson(ThemeMode m) => m.name;