[jdk21u-dev] RFR: 8226933: [TEST_BUG]GTK L&F: There is no swatches or RGB tab in JColorChooser

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle

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Commit messages:
 - Backport 5c4f1ef746b0c373a131726d74d27f0e0cc6e40d

Changes: https://git.openjdk.org/jdk21u-dev/pull/1308/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1308&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8226933
  Stats: 77 lines in 2 files changed: 74 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1308.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1308/head:pull/1308

PR: https://git.openjdk.org/jdk21u-dev/pull/1308