tests: fix expected test output

A previous commit enabled flowtable counters without properly adjusting
the testcase output.

Fixes: 04a06bd ("fw4: enable flowtable counters")
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

tests/01_configuration/01_ruleset

@@ -27,6 +27,7 @@ table inet fw4 {
 	flowtable ft {
 		hook ingress priority 0;
 		devices = { "eth0", "eth1" };
+		counter;
 		flags offload;
 	}