Fix not resetting the key when retrying to search the history store

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      format-stress-ppc-zseries-test failed on ~ Ubuntu 18.04 PPC

      Host: ubuntu1804-ppc-4.pic.build.10gen.cc
      Project: WiredTiger (develop)
      Commit: diff: WT-6175 Fix a warning. (#5818)

      (merged following discussion with @lukech) | 17 Jun 20 02:30 UTC
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              Assignee:
              Chenhao Qu
              Reporter:
              Xgen-Evergreen-User
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