Fix test_hs24 key order

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      unit-test failed on ~ Ubuntu 18.04 PPC

      Host: ubuntu1804-ppc-9.pic.build.10gen.cc
      Project: WiredTiger (develop)
      Commit: diff: WT-7807 Remove unused arg in backup_config. (#6768) | 09 Jul 21 01:35 UTC
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      Task Logs (unit-test)

              Assignee:
              Chenhao Qu
              Reporter:
              Xgen-Evergreen-User
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                Created:
                Updated:
                Resolved: