Fix incorrect code

scripts/Windows/Scripts/AppAssociations.ps1

@@ -43,7 +43,7 @@ $null = New-Module {
             $writerSettings.Indent = $true;
             $writerSettings.Encoding = [System.Text.UTF8Encoding]::new();
             $writer = [System.Xml.XmlWriter]::Create($configFile.FullName, $writerSettings);
-            $associations.Save($writer);
+            $document.Save($writer);
             $writer.Dispose();
             DISM /Online "/Import-DefaultAppAssociations:$($configFile.FullName)";
             Remove-Item $configFile;