Fix slideshow current slide index update logic

Jellyfin.Plugin.MediaBarEnhanced/Web/mediaBarEnhanced.js

@@ -2315,6 +2315,8 @@ const SlideshowManager = {
 
       currentSlide.classList.add("active");
       
+      STATE.slideshow.currentSlideIndex = index;
+
       // Restore focus for TV mode navigation continuity
       requestAnimationFrame(() => {
         if (focusSelector) {
@@ -2348,8 +2350,6 @@ const SlideshowManager = {
         if (logo) logo.classList.add("animate");
       }
 
-      STATE.slideshow.currentSlideIndex = index;
-
       if (index === 0 || !previousVisibleSlide) {
         const dotsContainer = container.querySelector(".dots-container");
         if (dotsContainer) {