reverted unnecessary change to DataObject

src/Speckle.Objects/Data/DataObject.cs

@@ -8,7 +8,7 @@ public class DataObject : Base, IDataObject
   public required string name { get; set; }
 
   [DetachProperty]
-  public required IReadOnlyList<Base> displayValue { get; set; }
+  public required List<Base> displayValue { get; set; }
 
   public required Dictionary<string, object?> properties { get; set; }