add piv6 to websites-template

interface/web/sites/templates/web_vhost_domain_edit.htm

@@ -74,7 +74,7 @@
                     {tmpl_var name='ip_address'}
                 </select></div>
             </div>
-            <div class="form-group" style="display:none">
+            <div class="form-group">
                 <label for="ipv6_address" class="col-sm-3 control-label">{tmpl_var name='ipv6_address_txt'}</label>
                 <div class="col-sm-9"><select name="ipv6_address" id="ipv6_address" class="form-control">
                     {tmpl_var name='ipv6_address'}