Quick fix for back link not working for unfurled mastodon links

This is obviously the wrong 'location'

src/utils/handle-content-links.js

@@ -45,6 +45,7 @@ function handleContentLinks(opts) {
     } else if (states.unfurledLinks[target.href]?.url) {
       e.preventDefault();
       e.stopPropagation();
+      states.prevLocation = location;
       location.hash = `#${states.unfurledLinks[target.href].url}`;
     }
   };