win_template: fix issue where dest was specified as a directory (#39887)

lib/ansible/modules/windows/win_file.ps1

@@ -15,6 +15,12 @@ $check_mode = Get-AnsibleParam -obj $params -name "_ansible_check_mode" -default
 $path = Get-AnsibleParam -obj $params -name "path" -type "path" -failifempty $true -aliases "dest","name"
 $state = Get-AnsibleParam -obj $params -name "state" -type "str" -validateset "absent","directory","file","touch"
 
+# used in template/copy when dest is the path to a dir and source is a file
+$original_basename = Get-AnsibleParam -obj $params -name "original_basename" -type "str"
+if ((Test-Path -Path $path -PathType Container) -and ($null -ne $original_basename)) {
+    $path = Join-Path -Path $path -ChildPath $original_basename
+}
+
 $result = @{
     changed = $false
 }