Add update backup list button to Nextcloud AIO Interface

[ThomasAndreini]

In case of disaster recovery, I have a complete Nextcloud AIO operating system image ready, along with the configurations I've applied. When I restore the image, the backup list isn't up to date, so I have to perform a list via check integrity backup, which takes a long time for a simple list update.

Describe the solution you'd like

It would be very helpful to add an option that only updates the list.