base: fix tabacco restore target

roles/base/templates/tabacco/restore-script.j2

@@ -27,7 +27,7 @@ if [ "x${ds}" = "x[]" ]; then
     echo "nothing to restore, skipping..." >&2
 else
     echo "starting restore of ${ds_pattern}..." >&2
-    tabacco restore "${ds_pattern}"
+    tabacco restore --target / "${ds_pattern}"
     if [ $? -gt 0 ]; then
         echo "ERROR: restore failed!" >&2
         exit 1