DeliveryJournal: correctly use .Include()

Elwig/Documents/DeliveryJournal.cshtml.cs

@@ -18,8 +18,7 @@ namespace Elwig.Documents {
 
         public DeliveryJournal(string filter, IQueryable<DeliveryPart> deliveries) :
             this(filter, deliveries
-                .Include(p => p.Delivery)
-                .Include(p => p.Delivery.Member)
+                .Include(p => p.Delivery).ThenInclude(d => d.Member)
                 .Include(p => p.Variant)
                 .ToList()) { }