fix world previews generation

src/frontend/screens/LevelScreen.cpp

@@ -94,7 +94,11 @@ LevelScreen::LevelScreen(
         renderer->clear();
         return false;
     }));
-
+    controller->preQuitCallbacks.listen([this]() {
+        if (!controller->getLevel()->getWorld()->isNameless()) {
+            saveWorldPreview();
+        }
+    });
     animator = std::make_unique<TextureAnimator>();
     animator->addAnimations(assets.getAnimations());
 
@@ -104,7 +108,6 @@ LevelScreen::LevelScreen(
 LevelScreen::~LevelScreen() {
     if (!controller->getLevel()->getWorld()->isNameless()) {
         saveDecorations();
-        saveWorldPreview();
     }
     scripting::on_frontend_close();
     // unblock all bindings