fix link to devboard, fixes #32

controllers/issues.php

@@ -131,10 +131,9 @@ final class IssuesController extends TracToGitlab\EventController
         ], $topic_id);
 
         $old_base = \URLHelper::setBaseURL($GLOBALS['ABSOLUTE_URI_STUDIP']);
-        $url = \PluginEngine::getURL(
-            'CoreForum',
-            ['cid' => $course_id],
-            "index/index/{$topic_id2}#{$topic_id2}"
+        $url = URLHelper::getURL(
+            "dispatch.php/course/index/index/{$topic_id2}#{$topic_id2}",
+            ['cid' => $course_id]
         );
         \URLHelper::setBaseURL($old_base);