use URLHelper again as $controller does not work in JSUpdater, fixes #891

app/views/messages/_message_row.php

 <tr id="message_<?= $message->getId() ?>" class="<?= $message->isRead() || $message['autor_id'] === $GLOBALS['user']->id ? "" : "unread" ?>">
     <td class="hidden-small-down"><input type="checkbox" name="bulk[]" value="<?= htmlReady($message->getId()) ?>"></td>
     <td class="title">
-        <a href="<?= $controller->read($message, $received ? 'rec' : 'snd') ?>" data-dialog>
+        <a href="<?= URLHelper::getLink('dispatch.php/messages/read/' . $message->getId() .'/' . ($received ? 'rec' : 'snd') ) ?>" data-dialog>
             <?= trim($message['subject']) ? htmlReady($message['subject']) : htmlReady(mila(kill_format($message['message']), 40)) ?>
             <div class="message-indicators">
                 <span><?= $message->getNumAttachments() ? Icon::create('staple', 'info', ["title" => _("Mit Anhang")])->asImg(20) : "" ?></span>