This PR adds a missing call to update the display value to the converter property listener
--------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - Fix combo box converter update Changes: https://git.openjdk.org/jfx/pull/2165/files Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=2165&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8384006 Stats: 54 lines in 2 files changed: 53 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jfx/pull/2165.diff Fetch: git fetch https://git.openjdk.org/jfx.git pull/2165/head:pull/2165 PR: https://git.openjdk.org/jfx/pull/2165
