Fix Read-Host behavior which mangles input

[TylerLeonhardt]

fixes PowerShell/vscode-powershell#2291

So this class constructor is needed to run for temp sessions but it's not needed for regular sessions.

I confirmed the following worked properly:

• Temp session with script: "Read-Host"
• Regular session with script: "Read-Host"
• Regular session with script: "'hi'"
  Temp session with script: "'hi'"

Eventually we want to get rid of this ExecuteScriptStringAsync for Constrained language mode support but this change gets us the expected behavior.

[TylerLeonhardt]

Here is an overview of what got changed by this pull request:

Complexity increasing per file
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- src/PowerShellEditorServices/Server/PsesDebugServer.cs  1
         

See the complete overview on Codacy