feat: Remove empty Windows.old folder (#793)

assets/win11x64-iot.xml

@@ -457,7 +457,7 @@
         </SynchronousCommand>
         <SynchronousCommand wcm:action="add">
           <Order>23</Order>
-          <CommandLine>rd /q c:\Windows.old 2>nul</CommandLine>
+          <CommandLine>cmd /C rd /q C:\Windows.old</CommandLine>
           <Description>Remove empty Windows.old folder</Description>
         </SynchronousCommand>
         <SynchronousCommand wcm:action="add">