Assume wifi is connected if the icon is says so

We used only the SSID to determine if we are connected. It can be that
the ssid is null but we are connected (the icon is not NO_NETWORK). In
that case, assume we are connected and show the default label.

Test: manual
Bug: 182916016
Change-Id: I5952c47696da37453dc39c28effe5e38cae1820b