Fix getRandomElement function

Now return an array item instead of an index

src/routes/shop/__layout.svelte

@@ -221,7 +221,7 @@
          */
         const productAPI = (!page.params.type && !page.params.name)
             // Get a random product
-            ? data.posters[getRandomElement(data.posters)]
+            ? getRandomElement(data.posters)
             // Get the current product from slug
             : data.posters.find(({ location }: any) => location.slug === page.params.name)