RFR: 8327748: Convert javax/swing/JFileChooser/6798062/bug6798062.java applet test to main

[Prasanta Sadhukhan]

Conversion of manual applet test to main based using PassFailJFrame manual framework

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Commit messages:
 - 8327748: Convert javax/swing/JFileChooser/6798062/bug6798062.java applet test to main

Changes: https://git.openjdk.org/jdk/pull/18180/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18180&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327748
  Stats: 108 lines in 2 files changed: 35 ins; 38 del; 35 mod
  Patch: https://git.openjdk.org/jdk/pull/18180.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18180/head:pull/18180

PR: https://git.openjdk.org/jdk/pull/18180