Fix conflicting shorthand switch -w for pwsh

[SteveL-MSFT]

PR Summary

For pwsh -w is already used for -windowstyle, but -wait also tries to use -w as the shorthand. This actually would have never worked as -w would have resolved to -windowstyle first and also -wait is only available in debug builds. Because this is only in debug builds, no doc change needed as -wait is not documented.

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[SteveL-MSFT]

macOS failure due to #12935 and unrelated to this PR

[ghost]

🎉v7.1.0-preview.4 has been released which incorporates this pull request.:tada:

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