There are two places to use a map file, one is in the label, as used here, and the other is in the binding config. Unfortunately when using a mapping in the label all it changes is how the value appears on the sitemap and there is no support for a transform on a zwave Item (as far as I can tell, though I primarily know OH 1 and don’t know if there is an OH 2 addition to support it).
So for what ever reason that device is reporting ON/OFF instead of OPEN/CLOSED so you will probably either need to create a proxy Item and a rule to convert the Switch to a Contact, of just use a Switch to represent that Item.