Fix a regression introduced by #8075

Fix #9547.

See
https://github.com/brave/browser-laptop/pull/8075/files#diff-49b40c07650f6f7cedce3f608d031b54L111.

The keys of "this.bookmarks" and "noParentItems" were originally integers before

After that, they are of the form "https://www.reddit.com/|0|0" (generated by
siteUtil.getSitekey(sideDetail)). See
https://github.com/brave/browser-laptop/blob/f3efaa104a7d57839f86b0e0211705b00c5399c1/js/state/siteUtil.js#L69-L84.

This breaks "noParentItems.getIn([i, attribute])" calls. See
https://github.com/brave/browser-laptop/blob/f3efaa104a7d57839f86b0e0211705b00c5399c1/app/renderer/components/bookmarks/bookmarksToolbar.js#L140
and
https://github.com/brave/browser-laptop/blob/f3efaa104a7d57839f86b0e0211705b00c5399c1/app/renderer/components/bookmarks/bookmarksToolbar.js#L147.

app/renderer/components/bookmarks/bookmarksToolbar.js

@@ -110,7 +110,7 @@ class BookmarksToolbar extends ImmutableComponent {
   }
   updateBookmarkData (props) {
     // TODO(darkdh): Remove siteSort when we have #9030 landed
-    this.bookmarks = siteUtil.getBookmarks(props.sites).sort(siteUtil.siteSort)
+    this.bookmarks = siteUtil.getBookmarks(props.sites).toList().sort(siteUtil.siteSort)
 
     const noParentItems = this.bookmarks
       .filter((bookmark) => !bookmark.get('parentFolderId'))