network: use nm_device_get_description()

It's better for human-readable display than nm_device_get_product().
Unlike nm_device_get_product(), it never returns an empty string and
sanitizes the string.

With NM 1.12 it goes to great lengths to clean up the messy udev
strings.

panels/network/cc-wifi-panel.c

@@ -288,7 +288,7 @@ update_devices_names (CcWifiPanel *self)
           object = g_ptr_array_index (self->devices, i);
           device = net_device_get_nm_device (NET_DEVICE (object));
 
-          net_object_set_title (object, nm_device_get_product (device));
+          net_object_set_title (object, nm_device_get_description (device));
         }
 
       /* Remove the widget at the "single" page */

panels/network/net-device-wifi.c

@@ -116,7 +116,7 @@ device_wifi_proxy_add_to_stack (NetObject    *object,
                                                      "notebook_view"));
         gtk_stack_add_titled (stack, widget,
                               net_object_get_id (object),
-                              nm_device_get_product (nmdevice));
+                              nm_device_get_description (nmdevice));
 
         return widget;
 }