[Barrio] Details elements have incorrect aria-describedby attributes

Problem/Motivation

This is a follow up issue for core patch https://www.drupal.org/project/drupal/issues/2896169, which add aria-describedby attributes for details correctly.

With that changes, theme with details.html.twig need to update accordingly, e.g.

diff --git a/core/themes/classy/templates/form/details.html.twig b/core/themes/classy/templates/form/details.html.twig
index c554096da9d785597c6e1e2c317e940002430981..140fa4ee7da4821b117b09c0eb2bd699013863e8 100644
--- a/core/themes/classy/templates/form/details.html.twig
+++ b/core/themes/classy/templates/form/details.html.twig
@@ -31,8 +31,8 @@
         <strong>{{ errors }}</strong>
       </div>
     {% endif %}
-    {%- if description -%}
-      <div class="details-description">{{ description }}</div>
+    {%- if description.content -%}
+      <div {{ description.attributes.addClass('details-description') }}>{{ description.content }}</div>
     {%- endif -%}
     {%- if children -%}
       {{ children }}