#576 und Refactoring

lib/main.dart

@@ -2,7 +2,6 @@ import 'dart:async';
 
 import 'package:flutter/material.dart';
 import 'package:geolocator/geolocator.dart';
-import 'package:is_lock_screen/is_lock_screen.dart';
 import 'package:isar/isar.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:stadtbote/messages/pop_content_view_message.dart';