Fix gc issue

include/app/app.h

@@ -27,7 +27,6 @@ struct Element {
   virtual Vec2<float> size(Window *window) = 0;
 
   void click() {
-    printf("Running click handler\n");
     on_click.call();
   }
 };
@@ -78,8 +77,7 @@ struct EText : Element {
 
   EText(Localization::Key key, uint64_t font_id, Color color, mrb_value params)
       : Element(Type::TEXT), key(key), font_id(font_id), color(color), params(params) {
-    if (!mrb_nil_p(params))
-      mrb_gc_protect(Ruby::mrb, params);
+    mrb_gc_register(Ruby::mrb, params);
     font_pool.use(font_id);
   }
 
@@ -170,7 +168,6 @@ struct Scene {
   void update_scene(uint64_t delta_time) {
     if (!mrb_nil_p(update.proc)) {
       mrb_value dt_val = mrb_int_value(Ruby::mrb, delta_time);
-      printf("running: update, dt: %lu\n", delta_time);
       update.call(1, &dt_val);
     }
   }