fix: Update flatpak command on download page

Fixes a typo in the flatpak installation command on the download page. Replaces "com.zen.browser" with "io.github.zen_browser" to ensure the correct package is installed.

src/components/download.tsx

@@ -151,7 +151,7 @@ export default function DownloadPage() {
     console.log("arch: ", arch);
     setHasDownloaded(true);
     addDownload(releaseTarget);
-    //window.location.replace(`${BASE_URL}/${releases[releaseTarget]}`);
+    window.location.replace(`${BASE_URL}/${releases[releaseTarget]}`);
     throwConfetti();
   };