[JDK-8139228](https://bugs.openjdk.org/browse/JDK-8139228) fix missed GTK updates for the same issue where file/directory name renders as `HTML text` instead of `plain text`. Adding the same fix for GTK L&F. Test for the fix : test/jdk/javax/swing/JFileChooser/HTMLFileName.java
------------- Commit messages: - GTK fix Changes: https://git.openjdk.org/jdk/pull/25707/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25707&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8358532 Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/25707.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/25707/head:pull/25707 PR: https://git.openjdk.org/jdk/pull/25707
