RFR: 8342082: Remove unused BasicProgressBarUI.Animator.interval [v3]

[Andrey Turbanov]

> The field `javax.swing.plaf.basic.BasicProgressBarUI.Animator.interval` is unused and can be removed.

Andrey Turbanov has updated the pull request incrementally with one additional commit since the last revision:

  8342082: Remove unused BasicProgressBarUI.Animator.interval
  
  optimize imports and static final MINIMUM_DELAY

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21132/files
  - new: https://git.openjdk.org/jdk/pull/21132/files/d93b287d..32bfab4e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21132&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21132&range=01-02

  Stats: 27 lines in 1 file changed: 20 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/21132.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21132/head:pull/21132

PR: https://git.openjdk.org/jdk/pull/21132