DAVE should not open the file browser

Right now the extension opens the file browser of the OS when clicking the “Download again” button. As the download step is integrated in the full scenario for installing, you shouldn’t open the browser when the download is over as people have to perform other steps before using the ISO.

See for example: https://tails.boum.org/install/win/usb/.

Parent Task: #8592 (closed)

Original created by @sajolida on 10682 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information