Containerd sysext: remove TORCX env vars from service unit

The systemd service unit shipped with the containerd sysext was still referring to TORCX variables. Since TORCX has been removed years ago, this is no longer required.

Author: t-lo

sdk_container/src/third_party/coreos-overlay/coreos/sysext/containerd/usr/lib/systemd/system/containerd.service

@@ -8,7 +8,7 @@ Delegate=yes
 Environment=CONTAINERD_CONFIG=/usr/share/containerd/config.toml
 ExecStartPre=mkdir -p /run/docker/libcontainerd
 ExecStartPre=ln -fs /run/containerd/containerd.sock /run/docker/libcontainerd/docker-containerd.sock
-ExecStart=/usr/bin/containerd --config ${TORCX_UNPACKDIR}${TORCX_IMAGEDIR}${CONTAINERD_CONFIG}
+ExecStart=/usr/bin/containerd --config ${CONTAINERD_CONFIG}
 KillMode=process
 Type=notify
 Restart=always