DEV: Replace DSection with body-class helper (#924)

Author: davidtaylorhq

assets/javascripts/discourse/connectors/after-d-editor/composer-open.hbs

@@ -1,5 +1,5 @@
 {{#if this.isAiBotChat}}
-  <DSection @bodyClass={{this.aiBotClasses}} />
+  {{body-class this.aiBotClasses}}
   {{#if this.renderChatWarning}}
     <div class="ai-bot-chat-warning">{{i18n
         "discourse_ai.ai_bot.pm_warning"