[jdk21u-dev] RFR: 8355366: Fix the wrong usage of PassFailJFrame.forcePass() in some manual tests

[Goetz Lindenmaier]

I backport this for parity with 21.0.9-oracle

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Commit messages:
 - Backport 2785570f5620db08c0d31cd29839f92ffabd58b2

Changes: https://git.openjdk.org/jdk21u-dev/pull/1965/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1965&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8355366
  Stats: 63 lines in 3 files changed: 27 ins; 24 del; 12 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1965.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1965/head:pull/1965

PR: https://git.openjdk.org/jdk21u-dev/pull/1965