Put warning in alert box (#5705)

Author: thom

interface/web/sites/templates/web_vhost_domain_backup.htm

@@ -40,7 +40,8 @@ <h4 class="panel-title">
         </div>
       </div>
       <tmpl_if name="missing_utils">
-        <div class="tab-content bg-warning text-warning">
+        <br>
+        <div class="tab-content alert alert-warning">
           {tmpl_var name='backup_missing_utils_txt'} {tmpl_var name='missing_utils'}
         </div>
       </tmpl_if>