network: Simplify and fix VPN settings menu item

As in commit b2b2f65 and furthermore it doesn't make much sense to
change the menu item according to the number of connections since all
connections here are of the same type.

https://bugzilla.gnome.org/show_bug.cgi?id=786520

js/ui/status/network.js

@@ -1491,36 +1491,7 @@ var NMVPNSection = new Lang.Class({
     _init: function(client) {
         this.parent(client);
 
-        this._vpnSettings = new PopupMenu.PopupMenuItem('');
+        this.item.menu.addSettingsAction(_("VPN Settings"), 'gnome-network-panel.desktop');
-        this.item.menu.addMenuItem(this._vpnSettings);
-        this._vpnSettings.connect('activate', Lang.bind(this, this._onSettingsActivate));
-
-        this._sync();
-    },
-
-    _sync: function() {
-        let nItems = this._connectionItems.size;
-        this.item.actor.visible = (nItems > 0);
-
-        if (nItems > 1)
-            this._vpnSettings.label.text = _("Network Settings");
-        else
-            this._vpnSettings.label.text = _("VPN Settings");
-
-        this.parent();
-    },
-
-    _onSettingsActivate: function() {
-        let nItems = this._connectionItems.size;
-        if (nItems > 1) {
-            let appSys = Shell.AppSystem.get_default();
-            let app = appSys.lookup_app('gnome-network-panel.desktop');
-            app.launch(0, -1, false);
-        } else {
-            let connection = this._connections[0];
-            Util.spawnApp(['gnome-control-center', 'network', 'show-device',
-                           connection.get_path()]);
-        }
     },
 
     _getDescription: function() {