Further work on refactor to interface based scripts

Plugins/PkmnLib.Plugin.Gen7/Scripts/Moves/HelpingHand.cs

@@ -3,9 +3,9 @@ using PkmnLib.Plugin.Gen7.Scripts.Pokemon;
 namespace PkmnLib.Plugin.Gen7.Scripts.Moves;
 
 [Script(ScriptCategory.Move, "helping_hand")]
-public class HelpingHand : Script
+public class HelpingHand : Script, IScriptOnSecondaryEffect
 {
     /// <inheritdoc />
-    public override void OnSecondaryEffect(IExecutingMove move, IPokemon target, byte hit) =>
+    public void OnSecondaryEffect(IExecutingMove move, IPokemon target, byte hit) =>
         target.Volatile.Add(new HelpingHandEffect());
 }