Update app.py

app.py

@@ -734,7 +734,7 @@ async def root():
                                 const ratingColor = getRatingColor(movie.rating_kp);
                                 let posterUrl = movie.poster_preview_url;
                                 if (!posterUrl) {
-                                    posterUrl = '/static/404.png';
+                                    posterUrl = '/404.jpg';
                                 }
 
                                 movieCard.innerHTML = `