Only pass value changed event to the native accessibility peer when the value is actually changed. While at fixing it for RadioButton also fixing it for checkbox and toggle button so there is no need to re-visit this file later. Also updating the copyright year.
------------- Commit messages: - 8309733: [macOS, Accessibility] VoiceOver: Incorrect announcements of JRadioButton Changes: https://git.openjdk.org/jdk/pull/14605/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14605&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8309733 Stats: 10 lines in 1 file changed: 6 ins; 0 del; 4 mod Patch: https://git.openjdk.org/jdk/pull/14605.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/14605/head:pull/14605 PR: https://git.openjdk.org/jdk/pull/14605
