Fix 'focus the compose textarea' shortcut is not working (#29059)

app/javascript/mastodon/features/ui/index.jsx

@@ -438,7 +438,7 @@ class UI extends PureComponent {
   handleHotkeyNew = e => {
     e.preventDefault();
 
-    const element = this.node.querySelector('.compose-form__autosuggest-wrapper textarea');
+    const element = this.node.querySelector('.autosuggest-textarea__textarea');
 
     if (element) {
       element.focus();