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

The publisher for cloud-images.ubuntu.com expects that artefacts
finishes with: file_url.endswith(project_prefix + suffix).
Now that we integrate app_id to the image name, we need thus to put it
before project_prefix and not between project_prefix and suffix.

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

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