allow to run borg check --repair from the AIO interface.

[szaimen]

On some instances it might be not possible to install a local borgbackup instance. There it would be really helpful to allow to run borg repair directly from the AIO interfae.

A failed borg chwck does not necessaeily mean that the backup aechive is coreupt e.g. if borg lock exists). So better point to look into the logs for clues what to do. But srill offer the option to repair if it should axtually be corrupt.

[szaimen]

This is now released with v4.1.0 Beta. Testing and feedback is welcome! See https://github.com/nextcloud/all-in-one#how-to-switch-the-channel