minor #17625 Fix choice_label (erichard)

This PR was submitted for the 6.2 branch but it was merged into the 5.4 branch instead.

Discussion
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Fix choice_label

`match` cannot by used directly by `choice_label` as the `$choice` variable does not exist

Commits
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76341b2 Fix choice_label

Author: javiereguiluz

reference/forms/types/enum.rst

@@ -63,7 +63,7 @@ dots or spaces). If you need more flexibility for these labels, use the
 
     ->add('textAlign', EnumType::class, [
         'class' => TextAlign::class,
-        'choice_label' => match ($choice) {
+        'choice_label' => fn ($choice) => match ($choice) {
             TextAlign::Left => 'text_align.left.label',
             TextAlign::Center => 'text_align.center.label',
             TextAlign::Right  => 'text_align.right.label',