Restore uploads have max filesize limit

[kaidesu]

Describe the issue

Currently, there is a max upload limit when uploading restores. This will prevent large sites from restoring if they wish to do so.

Expected behavior

There should be no limit on the uploaded file size for backups.

Version and browser

Version: v6.0.0 beta 0

Bug report checklist

• I have filled out as much information as I can
• I have detailed how the issue can be reproduced
• I have searched for existing issues and to the best of my knowledge this is not a duplicate