CmdPal: Fix a bug where dock label settings wouldn't save

[zadjii-msft]

This setting is totally vestigial, from the 0.9 dev cycle.

Unfortunately, the JSON parser would see that it wasn't in the settings.json, then it would write null to it. But ShowLabels was just a thin alias for ShowTitles, so we'd end up parsing totally sane JSON settings into having null for ShowTitle.

This fixes that. You can hide your titles again folks.

[github-actions]

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