Fixed aplication stuck active after root button activation

source/libublsettingsui-gtk3.c

@@ -539,6 +539,7 @@ void on_root_access(GtkWidget *, GtkWidget *window){
             pthread_t thread_id;
             pthread_create(&thread_id, NULL, (void *)on_root_get_root,argline);
             gtk_widget_destroy(window);
+            exit(0);
         }
     }
 }