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

[Prasanta Sadhukhan]

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.

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Commit messages:
 - jcheck
 - 8334581: Remove no-arg constructor BasicSliderUI()

Changes: https://git.openjdk.org/jdk/pull/22598/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22598&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334581
  Stats: 10 lines in 1 file changed: 0 ins; 10 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22598.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22598/head:pull/22598

PR: https://git.openjdk.org/jdk/pull/22598