Don't run IPv6-only v3 single onion service tests using chutney

Part of #23820.

src/test/include.am

@@ -42,8 +42,10 @@ TESTS += src/test/test src/test/test-slow src/test/test-memwipe \
 TEST_CHUTNEY_FLAVORS = basic-min bridges-min hs-v2-min hs-v3-min \
 	single-onion-v23
 # only run if we can ping6 ::1 (localhost)
+# IPv6-only v3 single onion services don't work yet, so we don't test the
+# single-onion-v23-ipv6 flavor
 TEST_CHUTNEY_FLAVORS_IPV6 = bridges+ipv6-min ipv6-exit-min hs-v23-ipv6 \
-	single-onion-v23-ipv6
+	single-onion-ipv6
 # only run if we can find a stable (or simply another) version of tor
 TEST_CHUTNEY_FLAVORS_MIXED = mixed+hs-v23