Fix typo in DeliveryPart

Elwig/Models/DeliveryPart.cs

@@ -105,6 +105,6 @@ namespace Elwig.Models {
         public virtual ISet<DeliveryPartModifier> PartModifiers { get; private set; }
 
         [NotMapped]
-        public IEnumerable<Modifier> Modifiiers => PartModifiers.Select(m => m.Modifier);
+        public IEnumerable<Modifier> Modifiers => PartModifiers.Select(m => m.Modifier);
     }
 }