RFR: 8334580: Deprecate no-arg constructor BasicSliderUI() for removal

[Prasanta Sadhukhan]

The no-arg constructor BasicSliderUI() was added under [JDK-8250852](https://bugs.openjdk.org/browse/JDK-8250852) by mistake. This constructor should be deprecated for removal in future release

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Commit messages:
 - -8334580: Deprecate no-arg constructor BasicSliderUI() for removal
 - -8334580: Deprecate no-arg constructor BasicSliderUI() for removal

Changes: https://git.openjdk.org/jdk/pull/19819/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19819&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334580
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19819.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19819/head:pull/19819

PR: https://git.openjdk.org/jdk/pull/19819