Fix back button navigation on backup details page

web/templates/admin/list_backup_detail.html

@@ -1,6 +1,7 @@
     <div class="l-center">
       <div class="l-sort clearfix noselect">
         <div class="l-unit-toolbar__buttonstrip">
+          <a class="ui-button cancel" href="/list/mail/"><i class="fas fa-arrow-left status-icon-blue"></i> <?=__('Back')?></a>
           <a href="/schedule/restore/?backup=<?=htmlentities($_GET['backup'])?>" class="ui-button cancel" title="<?=__('Restore All')?>"><i class="fas fa-undo status-icon-green"></i> <?=__('Restore All')?></a>
         </div>
         <div class="l-sort-toolbar clearfix">
@@ -391,7 +392,6 @@
             ?>
           </div>
           <div class="data-count l-unit__col l-unit__col--right back clearfix">
-            <a class="button cancel" href="/list/backup/"><?=__('Back')?></a>
           </div>
         </div>
       </div>