RFR: 8358532: JFileChooser in GTK L&F still displays HTML filename [v2]

[Tejesh R]

> [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

Tejesh R has updated the pull request incrementally with one additional commit since the last revision:

  updating test

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/25707/files
  - new: https://git.openjdk.org/jdk/pull/25707/files/77d8fb61..44328ffc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25707&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25707&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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