makes prototypeinheritance opt in

Content.Shared/Maps/ContentTileDefinition.cs

@@ -1,4 +1,4 @@
-#nullable enable
+#nullable enable
 using System.Collections.Generic;
 using JetBrains.Annotations;
 using Robust.Shared.Map;
@@ -15,10 +15,6 @@ namespace Content.Shared.Maps
         [ViewVariables]
         string IPrototype.ID => Name;
 
-        [ViewVariables]
-        [field: DataField("parent")]
-        public string? Parent { get; }
-
         [field: DataField("name", required: true)] public string Name { get; } = string.Empty;
 
         public ushort TileId { get; private set; }