Move OnInitialize to interface

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

@@ -1,14 +1,13 @@
 namespace PkmnLib.Plugin.Gen7.Scripts.Moves;
 
 [Script(ScriptCategory.Move, "drain")]
-public class Drain : Script
+public class Drain : Script, IScriptOnInitialize
 {
     public float DrainModifier { get; set; } = 0.5f;
 
     /// <inheritdoc />
-    public override void OnInitialize(IReadOnlyDictionary<StringKey, object?>? parameters)
+    public void OnInitialize(IReadOnlyDictionary<StringKey, object?>? parameters)
     {
-        base.OnInitialize(parameters);
         if (parameters == null)
             return;
         DrainModifier = parameters.GetValueOrDefault("drain_modifier") as float? ?? DrainModifier;