Fix visual issue with the encryption note (#5705)

Author: thom

interface/web/sites/templates/web_vhost_domain_backup.htm

@@ -72,7 +72,7 @@ <h4 class="panel-title">
   </div>
   <div id="collapseEncryption" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingEncryption">
     <div class="panel-body">
-      <div class="tab-content">
+      <div class="alert alert-info">
         {tmpl_var name='backup_encryption_note_txt'}
       </div>
       <div class="form-group">