test(systemtests): fix export v2 (#22799)

server/v2/store/server.go

@@ -78,9 +78,7 @@ func (s *Server[T]) Config() any {
 // An empty home directory *is* permitted at this stage, but attempting to build
 // the store with an empty home directory will fail.
 func UnmarshalConfig(cfg map[string]any) (*root.Config, error) {
-	config := &root.Config{
-		Options: root.DefaultStoreOptions(),
-	}
+	config := root.DefaultConfig()
 	if err := serverv2.UnmarshalSubConfig(cfg, ServerName, config); err != nil {
 		return nil, fmt.Errorf("failed to unmarshal store config: %w", err)
 	}