win_copy: Add missing check_mode fix (#31469)

* Add missing check_mode fix

* Refactor conditional to use the one embedded in Remove-Item

lib/ansible/modules/windows/win_copy.ps1

@@ -76,7 +76,7 @@ Function Copy-File($source, $dest) {
         }
 
         if (Test-Path -Path $dest -PathType Leaf) {
-            Remove-Item -Path $dest -Force -Recurse | Out-Null
+            Remove-Item -Path $dest -Force -Recurse -WhatIf:$check_mode | Out-Null
             $diff += "-$dest`n"
         }