[jdk21u-dev] 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: waitForDeduplication given wrong string for condition

Changes: https://git.openjdk.org/jdk21u-dev/pull/535/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=535&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-dev/pull/535.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/535/head:pull/535

PR: https://git.openjdk.org/jdk21u-dev/pull/535