There are no tabs available for GTK Look and Feel due to the different ColorChooser UI design. Updated the test to skip testing for GTK L&F.
------------- Commit messages: - Test update Changes: https://git.openjdk.org/jdk/pull/23128/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23128&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8347475 Stats: 10 lines in 1 file changed: 9 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/23128.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/23128/head:pull/23128 PR: https://git.openjdk.org/jdk/pull/23128
