[Feature request] Allow setting of `ShowConfirmButton` on `ListClock`.

[thargy]

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Is your feature request related to a problem? Please describe. See #1285 for more details Raising here to allow separate tracking.

Allowing ShowConfirmButton on ListClock, and setting it to false should cause SelectedTime to change whenever DisplayTime changes, causing 'instant' updates to the bound TextBox without requiring the confirm button to be clicked.

Describe the solution you'd like See above. Allow ListClock to support instant changing, rather than requiring 'confirm button' clicks.

Describe alternatives you've considered The existing implementation would continue to work fine, but this allows desirable behaviour with little additional work.

Additional context N/A