fix(steam-bell-92#1488): correct Number Sliding Puzzle image markup

Author: Shreya-nipunge

web-app/games.html

@@ -337,7 +337,7 @@
                 src="assets/banners/number-sliding-puzzle.webp"
                 alt="Number Sliding Puzzle"
                 loading="lazy"
-              / loading="lazy">
+              />
               <div class="card-actions">
                 <button class="btn-play" aria-label="Play Number Sliding Puzzle">Try It</button>
               </div>