sys_accounts uses non-existent nsc list flag

[philpennock]

In https://docs.nats.io/nats-server/nats_admin/sys_accounts/sys_accounts after:

The only thing we don't have handy is the public key for the system account. We can get it easy enough: (easily enough?) there is this command-line invocation:

nsc list accounts -W

That flag is not supported by that sub-command. It looks like nsc describe has a -W for --long-ids but this example should be re-examined by someone familiar with how things should be.