Display connect button in the wifi connection menu

When you quickly try to reconnect after forgeting the AP, the connection
is in DISCONNECTED state and we may still display the connect button

Change-Id: I755a259fdf68fab470d7f69aa461f5bcedddfd5b
Signed-off-by: Damien Vagner <damienx.vagner@intel.com>
Signed-off-by: Zhiquan Liu <zhiquan.liu@intel.com>