Remove unused service

Author: nattsw

assets/javascripts/discourse/components/post-menu/toggle-translation-button.gjs

@@ -12,7 +12,6 @@ export default class ToggleTranslationButton extends Component {
 
   @service modal;
   @service translator;
-  @service siteSettings;
 
   get isTranslating() {
     return this.args.post.isTranslating;