remove fallback to non-existing flash player, fixes #4207

Closes #4207

Merge request studip/studip!3036

lib/classes/StudipCoreFormat.php

@@ -618,11 +618,6 @@ class StudipCoreFormat extends TextFormat
             );
         }
 
-        if ($tag === 'audio') {
-            $random_id = 'audio-' . mb_substr(md5(uniqid('audio', true)), -8);
-            $media = str_replace('<audio ', '<audio id="' . $random_id . '" onerror="STUDIP.Audio.handle(this);" ', $media);
-        }
-
         if ($link && $tag === "img") {
             $media = sprintf('<a href="%s"%s>%s</a>',
                 $link,