tests: cover with stss test also automatic policy

tests-extra/tests/dnssec/single_type_signing/test.py

@@ -28,7 +28,7 @@ knot.gen_key(zones[2], ksk=True, alg="ECDSAP384SHA384", key_len="384")
 
 for zone in zones[:-1]:
     knot.dnssec(zone).enable = True
-    knot.dnssec(zone).manual = True
+    knot.dnssec(zone).single_type_signing = True
 
 # enable automatic Single-Type signing scheme with NSEC3 on the last zone
 knot.dnssec(zones[-1]).enable = True