RFR: 8334581: Remove no-arg constructor BasicSliderUI()

[Alexey Ivanov]

On Fri, 6 Dec 2024 06:37:28 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> The no-arg constructor BasicSliderUI() was added accidentally. It should be removed.
> 
> [JDK-8334580](https://bugs.openjdk.org/browse/JDK-8334580) deprecates the BasicSliderUI() constructor, and this follow-up is to remove the constructor.

Marked as reviewed by aivanov (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/22598#pullrequestreview-2484418144