Fix PPC test variables in evergreen.yml

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      format-stress-sanitizer-ppc-test failed on Ubuntu 18.04 PPC

      Host: ubuntu1804-ppc-7.pic.build.10gen.cc
      Project: WiredTiger (develop)
      Commit: diff: WT-6172 Fix silent failures of Evergreen test/format tasks (#5634) | 13 May 20 04:00 UTC
      Evergreen Subscription: ; Evergreen Event:

      Task Logs

              Assignee:
              Tammy Bailey (Inactive)
              Reporter:
              Xgen-Evergreen-User
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                Created:
                Updated:
                Resolved: