[jdk21u] RFR: 8309890: TestStringDeduplicationInterned.java waits for the wrong condition

[Alexandru C. Moraru]

Clean backport to pass the correct string so that `waitForDeduplication` does not always wait for 10 seconds before proceeding.

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Commit messages:
 - 8309890: TestStringDeduplicationTools waits on wrong condition for deduplication

Changes: https://git.openjdk.org/jdk21u/pull/445/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=445&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309890
  Stats: 4 lines in 1 file changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u/pull/445.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/445/head:pull/445

PR: https://git.openjdk.org/jdk21u/pull/445