Ensure ubuntu-wsl images can be published in cloud-images again.

The cloud-images logic is now special case for ubuntu-wsl to not require
ending with project_prefix. Readd it first, which will allow us to
ensure backward compability on cloud-images.ubuntu.com

live-build/ubuntu-wsl/hooks/99-tar.binary

@@ -84,7 +84,7 @@ create_archive_with_upgrade_policy() {
 
     cd chroot
     sed -i "s#Prompt=.*#Prompt=${upgrade_policy}#" ./etc/update-manager/release-upgrades
-    tar --xattrs --sort=name -czf ../livecd.${app_id}.ubuntu-wsl.rootfs.tar.gz *
+    tar --xattrs --sort=name -czf ../livecd.ubuntu-wsl.${app_id}.rootfs.tar.gz *
     cd ..
 }