NetworkMenu: fix regression in access-point-removed

When changing _findNetwork with _findExistingNetwork, I changed
the return value to avoid searching twice for the access point,
and changed some names. I forgot to update all points where those
names were used.

https://bugzilla.gnome.org/show_bug.cgi?id=663278

js/ui/status/network.js

@@ -1326,7 +1326,7 @@ NMDeviceWireless.prototype = {
                     this._overflowItem = null;
                 }
             }
-            this._networks.splice(pos, 1);
+            this._networks.splice(res.network, 1);
 
         } else if (apObj.item)
             apObj.item.updateAccessPoints(apObj.accessPoints);