[BUG] Fix RDST admissible sampling point method

[baraline]

Reference Issues/PRs

Fixes #2759

What does this implement/fix? Explain your changes.

Fix shapelet sampling point method returning the id of the choice, and not the timestamp linked to the id of the choice.

Any other comments?

See #2759 for performance comparison.

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[baraline]

Expected results seem to differ for some test configurations, not sure why yet

[MatthewMiddlehurst]

Happy to review when its resolved.

[baraline]

I'm currently clueless about why these fails, I cannot seem to reproduce the issue on my Ubuntu either ...
If anyone has any leads, I'd be grateful, otherwise i'll come back to this to do some bug hunting later.