feat(database): return newest journeys first

lib/transport_helper.dart

@@ -236,7 +236,12 @@ class Journey {
   static Future<List<Journey>> dbGetAll({int num = 40, int offset = 0}) async {
     //final batch = DbHelper.db.batch; // later
     Database database = DbHelper.db;
-    var tmp = await database.query(tableName, limit: num, offset: offset);
+    var tmp = await database.query(
+      tableName,
+      limit: num,
+      offset: offset,
+      orderBy: 'id DESC',
+    );
     Future<List<Journey>> journeys = Future.wait(
       tmp.map((jour) => fromMapWrapper(jour)),
     );
@@ -1178,4 +1183,4 @@ enum VehicleType {
   subway,
   regionalTrain,
   PLACEHOLDER,
-}
+}