Disable custom BBcode on signature

[CB|Steffen]

Patch for vBulletin 3.8.6

Index: includes/class_sigparser.php
===================================================================
--- includes/class_sigparser.php        (revision 4283)
+++ includes/class_sigparser.php        (working copy)
@@ -132,6 +132,13 @@
                if ($append_custom_tags)
                {
                        $this->append_custom_tags();
+
+                       // Disallow YouTube
+                       $this->tag_list['no_option']['youtube']['callback'] = 'check_bbcode_youtube';
+                       unset($this->tag_list['no_option']['youtube']['html']);
+
+                       $this->tag_list['option']['youtube']['callback'] = 'check_bbcode_youtube';
+                       unset($this->tag_list['option']['youtube']['html']);
                }
        }

@@ -155,6 +162,13 @@

                return $this->do_parse($text, $dohtml, $dosmilies, $dobbcode, $dobbimagecode, false, false);
        }
+
+       // Disallow YouTube
+       function check_bbcode_youtube($text)
+       {
+               $this->errors["$tag"] = 'tag_not_allowed';
+               return $text;
+       }

        /**
        * BB code callback allowed check