NLB-6212: fix zone_sync unit test

Author: xynicole

analyze_test.go

@@ -435,10 +435,10 @@ func TestAnalyze_zone_sync(t *testing.T) {
 			blockCtx{"stream"},
 			true,
 		},
-		"zone_sync invalid args": {
+		"zone_sync invalid with 2 args": {
 			&Directive{
 				Directive: "zone_sync",
-				Args:      []string{"invalid"},
+				Args:      []string{"invalid", "arg"},
 				Line:      5,
 			},
 			blockCtx{"stream", "server"},