update templates

contrib/templates/default/modlogin.mustache

@@ -9,6 +9,7 @@
       <label for="mod_key">secret</label>
       <input type="password" id="mod_key" name="privkey" />
       <input type="submit" value="login" />
+      {{{csrfField}}}
     </form>
   </body>
 </html>