RFR: 8335986: Test javax/swing/JCheckBox/4449413/bug4449413.java fails on Windows 11 x64 because RBMenuItem's and CBMenuItem's checkmark on the left side are not visible

[Prasanta Sadhukhan]

RBMenuItem's and CBMenuItem's checkmark on the left side are not visible while running on Windows L&F as background color is same as RBMenuItem/CBMenuItem's checkmark..
Modified the color so that they are visible..

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Commit messages:
 - 8335986: Test javax/swing/JCheckBox/4449413/bug4449413.java fails on Windows 11 x64 because RBMenuItem's and CBMenuItem's checkmark on the left side are not visible.

Changes: https://git.openjdk.org/jdk/pull/25864/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25864&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335986
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/25864.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25864/head:pull/25864

PR: https://git.openjdk.org/jdk/pull/25864