Microsoft.WinGet.DSC/WinGetAdminSettings throws Error

Brief description of your issue

When the DSC module attempts to de-serialize the Admin Settings, it fails with an error.

Steps to reproduce

Write a DSC resource to change a WinGet Admin Setting such as LocalManifestFiles. Test the configuration against the system.

Expected behavior

System state is tested and the DSC resource returns the correct status of the admin setting

Actual behavior

Apply :: WinGetAdminSettings
  The configuration unit failed while attempting to test the current system state.
Conversion from JSON failed with error: Unexpected character encountered while parsing value: S. Path '', line 0, position 0.
<See the log file for additional details>

The DSC module attempts to get the settings when testing a configuration file.

# Gets the administrator settings.
    [WinGetAdminSettings] Get()
    {
        Assert-WinGetCommand "Get-WinGetSettings"
        $settingsJson = Get-WinGetSettings | ConvertFrom-Json -AsHashtable
        # Get admin setting values.

        $result = @{
            SID = ''
            Settings = $settingsJson.adminSettings
        }
        return $result
    }

Running Get-WinGetSettings | ConvertFrom-Json -AsHashtable in PowerShell gives same Conversion from JSON error, which leads me to believe that the settings deserialization needs to be updated

Environment

PS C:\Users\Trenly> winget --info
Windows Package Manager (Preview) v1.7.3172-preview
Copyright (c) Microsoft Corporation. All rights reserved.

Windows: Windows.Desktop v10.0.19045.3693
System Architecture: X64
Package: Microsoft.DesktopAppInstaller v1.22.3172.0

Winget Directories
-------------------------------------------------------------------------------------------------------------------------------
Logs                               %LOCALAPPDATA%\Packages\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\LocalState\DiagOutputDir
User Settings                      %LOCALAPPDATA%\Packages\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\LocalState\settings.json
Portable Links Directory (User)    %LOCALAPPDATA%\Microsoft\WinGet\Links
Portable Links Directory (Machine) C:\Program Files\WinGet\Links
Portable Package Root (User)       %LOCALAPPDATA%\Microsoft\WinGet\Packages
Portable Package Root              C:\Program Files\WinGet\Packages
Portable Package Root (x86)        C:\Program Files (x86)\WinGet\Packages
Installer Downloads                D:\Users\Trenly\Downloads

Links
---------------------------------------------------------------------------
Privacy Statement   https://aka.ms/winget-privacy
License Agreement   https://aka.ms/winget-license
Third Party Notices https://aka.ms/winget-3rdPartyNotice
Homepage            https://aka.ms/winget
Windows Store Terms https://www.microsoft.com/en-us/storedocs/terms-of-sale

Admin Setting                             State
--------------------------------------------------
LocalManifestFiles                        Enabled
BypassCertificatePinningForMicrosoftStore Disabled
InstallerHashOverride                     Disabled
LocalArchiveMalwareScanOverride           Enabled


PS C:\Users\Trenly> $(Get-Module).Where({$_.Name -match 'winget'})

ModuleType Version    PreRelease Name                                ExportedCommands
---------- -------    ---------- ----                                ----------------
Binary     1.6.3133.0            Microsoft.WinGet.Client             {Add-WinGetSource, Assert-WinGetPackageManager, Disable-WinGetSetting, Enable-WinGetSetting…}

PS C:\Users\Trenly> $(Get-DSCResource).Where({$_.ModuleName -match 'winget'})| Select-Object -Property ModuleName,Version -Unique

ModuleName           Version
----------           -------
Microsoft.WinGet.DSC 0.2.0

Start with the WinGetAdminSettings Get() method shown in the issue and reproduce Get-WinGetSettings | ConvertFrom-Json -AsHashtable in PowerShell. Trace the returned settings format and the conversion failure. Done means the DSC resource can test the system state and report the administrator setting status without the JSON conversion error.