removed unused code and files

lib/view/settings/defaultSettings.dart

@@ -6,7 +6,6 @@ import '../../storage/base/settings.dart';
 import '../../storage/devTools/devToolsSettings.dart';
 import '../../storage/file/fileSettings.dart';
 import '../../storage/fileView/fileViewSettings.dart';
-import '../../storage/gradeAverages/gradeAveragesSettings.dart';
 import '../../storage/holidays/holidaysSettings.dart';
 import '../../storage/notification/notificationSettings.dart';
 import '../../storage/talk/talkSettings.dart';
@@ -17,11 +16,6 @@ class DefaultSettings {
   static Settings get() => Settings(
       appTheme: ThemeMode.system,
       devToolsEnabled: false,
-      gradeAveragesSettings: GradeAveragesSettings(
-          useGradeSystem: true,
-          askedForPreferredGradeSystem: false,
-          inputs: []
-      ),
       timetableSettings: TimetableSettings(
         connectDoubleLessons: false,
       ),