Reverse default sort + ability to reverse sort

## Which version of floccus are you using?

v5.0.9 (advertised v5.0.8 inApp/about)

## Sync method

Nextcloud Bookmarks

## Which browser are you using? In case you are using the phone App, specify the Android or iOS version and device please.

Android 9 (OxygenOS OP5T_O²_BETA_33) - OnePlus 5T

## Which version of Nextcloud Bookmarks are you using? (if relevant)

1.24

## Which version of Nextcloud? (if relevant)

v27.1.5.1

## What kind of WebDAV server are you using? (if relevant)

No response

## Describe the Bug

Bookmarks default sort seems to be by id ascending, which shows kinda outdated data. We need to scroll all the way down since there's no way to reverse the order or to change it for lastly added.

## Expected Behavior

App should start with the last selected sort order, which is another issue (_cannot easily crossref from mobile yet_).

But when not specified, that is to say "by default", it should at least be sorting bookmarks by last added (ie by id descending).

Default sort by last added would allow to quickly check last bookmarks saved (kinda cache effect).

This would be pretty useful when we encounter regular sync problem, for example, but as well just to remember the last cool think we've just saved.

By the way, allow reversing the sort order would be nice.

## To Reproduce

Start the app, choose an account with a lot of bookmarks, scroll a lot to find the last one saved.

## Debug log (NOT) provided

I have NOT provided a debug log file

## Many thanks

I'm mostly using this app instead of Nextcloud's default Bookmark app which I find slow and buggy. So, thank you very much.

No file or test is named in the issue. Reproduce the behavior on Android 9 with a large Nextcloud Bookmarks account, then trace the bookmark-list sorting entry point. Done means newly added bookmarks appear first by default and users can reverse the sort order, with the selected order retained if supported.

Written by the indexing model from the issue text.