RFR: 8337457: Redundant Math.round call in AquaProgressBarUI#getStringPlacement

[Prasanta Sadhukhan]

Since  Math.round with integer argument returns the same value, and also since all arguments and calculations in the AquaProgressBarUI#getStringPlacement are integer arithmetic, Math.round is redundant and can be removed

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Commit messages:
 - 8337457: Redundant Math.round call in AquaProgressBarUI#getStringPlacement

Changes: https://git.openjdk.org/jdk/pull/20400/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20400&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337457
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/20400.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20400/head:pull/20400

PR: https://git.openjdk.org/jdk/pull/20400