Set servers list as default facet in topology facet group

Since there is a new warning about only one CA server, the default facet
of topology facet group is set to servers list where the warning is.
So the warning will be shown right after clicking on Topology section.

Part of: https://fedorahosted.org/freeipa/ticket/5828

Reviewed-By: Tomas Krizek <tkrizek@redhat.com>

install/ui/src/freeipa/navigation/menu_spec.js

@@ -212,7 +212,7 @@ var nav = {};
                     ]
                 },
                 {
-                    entity: 'topologysuffix',
+                    entity: 'server',
                     label: '@i18n:tabs.topology',
                     facet: 'search',
                     children: [