PR Summary

Reformatted a check to see if the environment was appveyor

PR Context

Appveyor removed and #8686
I have made it my personal mission to hunt down all these references and destroy them, one by one (or in large quantities as will be seen in my next PR!)

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge and is not Work in Progress.
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• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed
    • Issue filed: [docs] [code] AppVeyor/Travis CI references exist #8686
• Testing - New and feature
  • N/A or can only be tested interactively
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  • Make sure you've added a new test if existing tests do not effectively test the code changed
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