Clean up corrupted Shared, Unversioned template fields

cleanupSharedAndUnversionedFields.ps1

$dataFolder = [Sitecore.Configuration.Settings]::DataFolder
$tempFolder = $dataFolder + "\temp\upload"
$filePath = Receive-File -Path $tempFolder -overwrite
 
if($filePath -eq "cancel"){
    exit
}

$importList =  Import-Csv $filePath

foreach ( $row in $importList ) {
    $templateField = Get-Item -Path "master:" -ID $row.ItemID
    $sharedValue = $templateField.Fields["Shared"].Value
    $unversionedValue = $templateField.Fields["Unversioned"].Value

    $templateField.Editing.BeginEdit()
    $templateField.Fields["Shared"].Value = "0"
    $templateField.Fields["Unversioned"].Value = "0"
    $templateField.Editing.EndEdit() 
    
    $templateField.Editing.BeginEdit()
    $templateField.Fields["Shared"].Value = "0"
    $templateField.Fields["Unversioned"].Value = "1"
    $templateField.Editing.EndEdit()  
    
    $templateField.Editing.BeginEdit()
    $templateField.Fields["Shared"].Value = "1"
    $templateField.Fields["Unversioned"].Value = "0"
    $templateField.Editing.EndEdit()  
    
    $templateField.Editing.BeginEdit()
    $templateField.Fields["Shared"].Value = $sharedValue
    $templateField.Fields["Unversioned"].Value = $unversionedValue
    $templateField.Editing.EndEdit()  
}