[Web] PHP8 fix, fixes #4259 (#4261)

Signed-off-by: Kristian Feldsam <feldsam@gmail.com>

data/web/debug.php

@@ -39,7 +39,7 @@ $clamd_status = (preg_match("/^([yY][eE][sS]|[yY])+$/", $_ENV["SKIP_CLAMD"])) ?
         <div class="debug-log-info"><?=sprintf($lang['debug']['log_info'], getenv('LOG_LINES') + 1);?></div>
         <?php
           $exec_fields = array('cmd' => 'system', 'task' => 'df', 'dir' => '/var/vmail');
-          $vmail_df = explode(',', json_decode(docker('post', 'dovecot-mailcow', 'exec', $exec_fields), true));
+          $vmail_df = explode(',', (string)json_decode(docker('post', 'dovecot-mailcow', 'exec', $exec_fields), true));
         ?>
         <div role="tabpanel" class="tab-pane active" id="tab-containers">
           <div class="panel panel-default">

data/web/inc/functions.rspamd.inc.php

@@ -77,7 +77,7 @@ function rsettings($_action, $_data = null) {
         $_SESSION['return'][] = array(
           'type' => 'success',
           'log' => array(__FUNCTION__, $_action, $_data_log),
-          'msg' => array('object_modified', htmlspecialchars($ids))
+          'msg' => array('object_modified', htmlspecialchars(implode(',', $ids)))
         );
       }
     break;