Allow to set weight of a server without location

There was a bug when a new server was added it was not possible to set weight until
a location was set. This change corrects it and allows user to set a weight of server
without location.

Part of: https://fedorahosted.org/freeipa/ticket/5905

Reviewed-By: Petr Vobornik <pvoborni@redhat.com>

install/ui/src/freeipa/topology.js

@@ -240,7 +240,8 @@ return {
                         },
                         {
                             name: 'ipaserviceweight',
-                            placeholder: '100'
+                            placeholder: '100',
+                            flags: ['w_if_no_aci']
                         },
                         {
                             $type: 'association_table',