network: Fix Wi-Fi network with "&" in name not appearing
My neighbours' Wi-Fi makes the Wi-Fi panel throw an error:
(gnome-control-center:346639): Gtk-WARNING **: 15:16:21.993: Failed to set text 'Bbox Hugo & Laura' from markup due to error parsing markup: Error on line 1: Entity did not end with a semicolon; most likely you used an ampersand character without intending to start an entity — escape ampersand as &
Escape the SSID before using it to set the label.