metabase/test: Fix end of iteration error check

This is not good:
```
BenchmarkListWithCursor/1_item-8                --- FAIL: BenchmarkListWithCursor/1_item-8
    list_test.go:63: error: end of object listing
```

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/local_object_storage/metabase/list_test.go

@@ -59,7 +59,7 @@ func benchmarkListWithCursor(b *testing.B, db *meta.DB, batchSize int) {
 	for range b.N {
 		res, err := db.ListWithCursor(context.Background(), prm)
 		if err != nil {
-			if errors.Is(err, meta.ErrEndOfListing) {
+			if !errors.Is(err, meta.ErrEndOfListing) {
 				b.Fatalf("error: %v", err)
 			}
 			prm.SetCursor(nil)