ISTWCMS-6289: Fix the alt tag print on grid image gallery

src/patterns/04-components/image-gallery/_image-gallery.twig

@@ -83,7 +83,7 @@
           <div class="uw-ig__item">
             <div class="uw-ig__image">
               <a class="uw-lightbox__open" href="#uw-lightbox-{{image_gallery.images.id }}-{{ index }}">
-                <img src="{{ image.image.thumbnail }}" alt="{{ image.image.alt }}" />
+                <img src="{{ image.image.thumbnail }}" alt="{{ image.alt }}" />
               </a>
 
               {% if image.caption %}