[jdk17u-dev] RFR: 8327748: Convert javax/swing/JFileChooser/6798062/bug6798062.java applet test to main

[Satyen Subramaniam]

Backporting JDK-8327748: Convert javax/swing/JFileChooser/6798062/bug6798062.java applet test to main. Ran GHA Sanity Checks and adjusted test directly. Patch is clean. Backporting for parity with Oracle.

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Commit messages:
 - Backport 782206bc97dc6ae953b0c3ce01f8b6edab4ad30b

Changes: https://git.openjdk.org/jdk17u-dev/pull/3972/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3972&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327748
  Stats: 106 lines in 2 files changed: 35 ins; 43 del; 28 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3972.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3972/head:pull/3972

PR: https://git.openjdk.org/jdk17u-dev/pull/3972