luci-mod-network: allow sorting static leases

Fixes: #5453
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
(cherry picked from commit f4f64b91ca)

modules/luci-mod-network/htdocs/luci-static/resources/view/network/dhcp.js

@@ -504,6 +504,7 @@ return view.extend({
 
 		ss.addremove = true;
 		ss.anonymous = true;
+		ss.sortable = true;
 
 		so = ss.option(form.Value, 'name', _('Hostname'));
 		so.validate = validateHostname;