fixup! fixup! Node: Add support for NEO cluster with > 1 master

I missed the following build failure in go/neo/cmd:

    # lab.nexedi.com/kirr/neo/go/neo/cmd/neo
    ./storage.go:128:37: cannot use master (variable of type string) as []string value in argument to neo.NewStorage

go/neo/cmd/neo/storage.go

-// Copyright (C) 2016-2021  Nexedi SA and Contributors.
+// Copyright (C) 2016-2023  Nexedi SA and Contributors.
 //                          Kirill Smelkov <kirr@nexedi.com>
 //
 // This program is free software: you can Use, Study, Modify and Redistribute
@@ -125,7 +125,7 @@ func storageMain(argv []string) {
 		}()
 
 		return listenAndServe(ctx, net, *bind, func(ctx context.Context, l xnet.Listener) error {
-			stor := neo.NewStorage(*cluster, master, net, back)
+			stor := neo.NewStorage(*cluster, []string{master}, net, back)
 			back = nil
 			return stor.Run(ctx, l)
 		})