Fix type inference of parameters in classic functions

[MartinGC94]

PR Summary

Fixes type inference for parameters in classic function definitions where the parameters outside the scriptblock definition: function X ([string]$Param1){}

PR Context

I broke it with: #19830

PR Checklist

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• Breaking changes
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  • Experimental feature(s) needed
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• User-facing changes
  • Not Applicable
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  • Documentation needed
    - [ ] Issue filed:
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• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
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    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
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    • Impact on EditorSyntax (which provides syntax highlighting with in VSCode, GitHub, and many other editors).
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