makes prototypeinheritance opt in

Content.Shared/Actions/BaseActionPrototype.cs

@@ -1,4 +1,4 @@
-#nullable enable
+#nullable enable
 using System;
 using System.Collections.Generic;
 using Robust.Shared.Log;
@@ -18,10 +18,6 @@ namespace Content.Shared.Actions
     {
         public abstract string ID { get; }
 
-        [ViewVariables]
-        [field: DataField("parent")]
-        public string? Parent { get; }
-
         /// <summary>
         /// Icon representing this action in the UI.
         /// </summary>