Forum: Accept bool visibility to avoid TypeError

Author: christianbeeznest

public/main/forum/forumfunction.inc.php

@@ -944,10 +944,11 @@ function getLastPostOfThread(int $threadId): array
 function returnVisibleInvisibleIcon(
  string $content,
  int $id,
- int $current_visibility_status,
+ int|bool $current_visibility_status,
  array $additional_url_parameters = []
 ): string
 {
+ $current_visibility_status = (int) $current_visibility_status;
  $html = '';
 
  if (1 == $current_visibility_status) {