RFR: 8306712: CDS DeterministicDump.java test fails with -XX:+UseStringDeduplication

[Calvin Cheung]

Please review this change for:

- disabling `UseStringDeduplication` while dumping CDS archive;
- removing the unnecessary `!compressed` check from the test.

Passed tiers 1 - 4 testing.

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Commit messages:
 - 8306712: CDS DeterministicDump.java test fails with -XX:+UseStringDeduplication

Changes: https://git.openjdk.org/jdk/pull/13810/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13810&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306712
  Stats: 10 lines in 2 files changed: 5 ins; 5 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13810.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13810/head:pull/13810

PR: https://git.openjdk.org/jdk/pull/13810