fix(web): use fallback image if shared asset isn't resized (#11704)

* fix(web): use fallback image if shared asset isn't resized

* remove test-data index file

web/src/lib/components/sharedlinks-page/covers/share-cover.svelte

@@ -15,7 +15,7 @@
 <div class="relative aspect-square shrink-0">
   {#if link?.album}
     <AlbumCover album={link.album} class={className} {preload} />
-  {:else if link.assets[0]}
+  {:else if link.assets[0]?.resized}
     <AssetCover
       alt={$t('individual_share')}
       class={className}