fix: GameMode is no longer named GameState

src/game_mode.hpp

@@ -8,8 +8,8 @@ namespace godot {
 class Level;
 class Player;
 
-class GameState : public Node {
-    GDCLASS(GameState, Node)
+class GameMode : public Node {
+    GDCLASS(GameMode, Node)
     static void _bind_methods();
 protected:
     Level *currentLevel{nullptr};