Add LuaCsSetup.Lua back for compatibility

Author: evilfactory

Barotrauma/BarotraumaShared/SharedSource/LuaCs/LuaCsSetup.cs

@@ -83,7 +83,7 @@ private void SubscribeToLuaCsEvents()
         // hotpath performance ref cache
         private LuaGame _game;
         public LuaGame Game => _game ??= _servicesProvider.GetService<LuaGame>();
-
+        public Script Lua => LuaScriptManagementService.InternalScript;
 
         /// <summary>
         /// Whether C# plugin code is enabled.