Fix an inconsistency with spacetime server fingerprint

[jdetter]

Description of Changes

Please describe your change, mention any related tickets, and so on here.

Previous command:

spacetime server fingerprint <server>

New command:

spacetime server fingerprint -s <server>

if no -s <server> is supplied, the default server will be fingerprinted.

API and ABI breaking changes

If this is an API or ABI breaking change, please apply the
corresponding GitHub label.

Technically yes, just a CLI change

Expected complexity level and risk

How complicated do you think these changes are? Grade on a scale from 1 to 5,
where 1 is a trivial change, and 5 is a deep-reaching and complex change.

This complexity rating applies not only to the complexity apparent in the diff,
but also to its interactions with existing and future code.

If you answered more than a 2, explain what is complex about the PR,
and what other components it interacts with in potentially concerning ways.

0

Testing

Describe any testing you've done, and any testing you'd like your reviewers to do,
so that you're confident that all the changes work as expected!

• Write a test you've completed here.
• Try spacetime server fingerprint and spacetime server fingerprint -s <server>

[bfops]

✔️ Seems broadly correct