Broken links in scw- scripts

[khumarahn]

Hi, I wanted to update the scripts on my rather old server. I found that there are a few broken links of type
https://raw.githubusercontent.com/scaleway/image-tools/master/builder/unit.bash. I found them in

• https://github.com/scaleway/image-tools/blob/master/bases/overlay-common/usr/local/sbin/scw-update-scripts
• https://github.com/scaleway/image-tools/blob/master/bases/overlay-common/usr/local/sbin/scw-image-unit