RFR: 8328300: Convert PrintDialogsTest.java from Applet to main program

[Phil Race]

This applet test is converted to a main program using PassFailJFrame.
Other than that, the main thing I improved is the instructions.

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Commit messages:
 - 8328300
 - 8328300
 - 8328300

Changes: https://git.openjdk.org/jdk/pull/18333/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18333&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328300
  Stats: 124 lines in 2 files changed: 63 ins; 54 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/18333.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18333/head:pull/18333

PR: https://git.openjdk.org/jdk/pull/18333