[jdk20] RFR: 8298905: Test "java/awt/print/PrinterJob/ImagePrinting/PrintARGBImage.java" fails because the frames of instruction does not display

Fri Dec 16 15:02:34 UTC 2022

openjdk/jdk#9525 has changed behavior of PassFailJFrame.
it doesn't call `setVisible()` from its constructor on instruction window anymore and some tests were not ready for that.

So adding `positionTestWindow()` fixes the issue.

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Commit messages:
 - initial

Changes: https://git.openjdk.org/jdk20/pull/46/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20&pr=46&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298905
  Stats: 6 lines in 3 files changed: 4 ins; 2 del; 0 mod
  Patch: https://git.openjdk.org/jdk20/pull/46.diff
  Fetch: git fetch https://git.openjdk.org/jdk20 pull/46/head:pull/46

PR: https://git.openjdk.org/jdk20/pull/46