Change reset deletion order to avoid racecondition

If the k3s binary is launched after the deletion of `/var/lib/rancher/k3s`, k3s
will automatically create this directory. This change deletes the k3s binary
first so that it cannot be called after `/var/lib/rancher/k3s` is deleted

Signed-off-by: Julien DOCHE <julien.doche@gmail.com>