[jdk21u-dev] RFR: 8329320: Simplify awt/print/PageFormat/NullPaper.java test

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle

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Commit messages:
 - Backport 5cf457b74334c08bab40e2e6c1a8544a2555fb82

Changes: https://git.openjdk.org/jdk21u-dev/pull/1345/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1345&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329320
  Stats: 177 lines in 1 file changed: 6 ins; 155 del; 16 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1345.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1345/head:pull/1345

PR: https://git.openjdk.org/jdk21u-dev/pull/1345