Fix $PSNativeCommandArgPassing = Windows to handle empty args correctly

[SteveL-MSFT]

PR Summary

When the new Windows mode was added to $PSNativeCommandArgPassing, the PR didn't change some of the logic as it only expected Standard and Legacy. The intent was that Windows would be Standard, but have exception to fallback to Legacy for a specific set of extensions and executables to maintain compatibility. This resulted in Windows having the Legacy behavior when it came to empty args which get dropped. The fix is to change the handling so instead of checking for Standard it checks if it's not Legacy.

PR Context

Brought to my attention by .NET team member

PR Checklist

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• Breaking changes
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  • OR
  • Experimental feature(s) needed
    • Experimental feature name(s): PSNativeCommandArgumentPassing
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    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
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This PR has 19 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Label      : Extra Small
Size       : +16 -3
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Total files changed: 2

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.cs : +2 -2
.ps1 : +14 -1

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[ghost]

This pull request has been automatically marked as Review Needed because it has been there has not been any activity for 7 days.
Maintainer, please provide feedback and/or mark it as Waiting on Author

[JamesWTruher]

lgtm

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🎉v7.3.0-preview.2 has been released which incorporates this pull request.:tada:

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