Change behavior of privacy dropdown to only change value on validation (#29406)

app/javascript/mastodon/features/compose/components/language_dropdown.jsx

@@ -141,6 +141,7 @@ class LanguageDropdownMenu extends PureComponent {
     case 'Escape':
       onClose();
       break;
+    case ' ':
     case 'Enter':
       this.handleClick(e);
       break;