fixed bug for wpforo shortcodes.

.gitignore

@@ -4,3 +4,4 @@
 *.bak
 .idea/
 .php_cs.cache
+.php-cs-fixer.cache

functions.php

@@ -301,6 +301,7 @@ function cbsonline_wpforo_after_init_current_object($current_object, $wpf_url_pa
                 ];
                 $current_object['topics'] = cbsonline_wpforo_topic_get_topics($args, $current_object['items_count']);
             }
+            $current_object['categories'] = [$forum];
         } else {
             $current_object['is_404'] = true;
         }