When a move is changed through the ChangeMove hook, update the script

PkmnLib.Dynamic/Models/BattleFlow/MoveTurnExecutor.cs

@@ -22,7 +22,16 @@ internal static class MoveTurnExecutor
                 throw new InvalidOperationException(
                     $"The move was changed to '{moveDataName}' by a script, but this move does not exist.");
             }
-            // FIXME: Change the script on the move when it is changed.
+            var secondaryEffect = moveData.SecondaryEffect;
+            if (secondaryEffect != null)
+            {
+                if (moveChoice.User.Library.ScriptResolver.TryResolve(ScriptCategory.Move, secondaryEffect.Name, out var script))
+                {
+                    moveChoice.Script.Set(script);
+                    script.OnInitialize(moveChoice.User.Library, secondaryEffect.Parameters);
+                }
+            }
+
         }
 
         var targetType = moveData.Target;

PkmnLib.Dynamic/ScriptHandling/ScriptContainer.cs

@@ -49,10 +49,7 @@ public class ScriptContainer : IEnumerable<ScriptContainer>
     /// <param name="script"></param>
     public void Set(Script script)
     {
-        if (Script is not null)
-        {
-            Script.OnRemove();
-        }
+        Script?.OnRemove();
         Script = script;
     }