Fixes up pre-value formatted data so it doesn't include ID in the value since this confuses things.

src/Umbraco.Web/Models/ContentEditing/PreValueFieldDisplay.cs

@@ -8,6 +8,12 @@ namespace Umbraco.Web.Models.ContentEditing
     [DataContract(Name = "preValue", Namespace = "")]
     public class PreValueFieldDisplay : PreValueFieldSave
     {
+        ///// <summary>
+        ///// The id of the pre-value field
+        ///// </summary>
+        //[DataMember(Name = "id", IsRequired = true)]
+        //public int Id { get; set; }
+
         /// <summary>
         /// The name to display for this pre-value field
         /// </summary>