RFR: 8224261: JProgressBar always with border painted around it [v6]

[Abhishek Kumar]

> JProgressBar is always painted with border irrespective of the value set via the API `setBorderPainted(boolean value)` in Synth (Nimbus and GTK) LAF. Proposed fix is to add a check before painting the component.
> 
> CI jobs are green after the fix. Links attached to JBS.

Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:

  Remove line break

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16467/files
  - new: https://git.openjdk.org/jdk/pull/16467/files/93c88c90..a00f11fe

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16467&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16467&range=04-05

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16467.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16467/head:pull/16467

PR: https://git.openjdk.org/jdk/pull/16467