Normalize indentation of app association config

scripts/Windows/Scripts/AppAssociations.ps1

@@ -38,7 +38,6 @@ $null = New-Module {
             $configFile = New-TemporaryFile;
             $writerSettings = [System.Xml.XmlWriterSettings]::new();
             $writerSettings.Indent = $true;
-            $writerSettings.IndentChars = "    ";
             $writerSettings.Encoding = [System.Text.UTF8Encoding]::new();
             $writer = [System.Xml.XmlWriter]::Create($configFile.FullName, $writerSettings);
             $associations.Save($writer);