Added Mint for U.S. 2015 Mohawk Ironworkers 1 Dollar

For the U.S. 2015 Mohawk Ironworkers 1 Dollar, the page has the Philadelphia, Denver, and San Francisco Mints listed. However, The West Point mint (W) also made these coins for very special sets.
This is the link to the Numista page. Please add 2015 (W) with the comment of: Enhanced Unc. Set
https://en.numista.com/catalogue/pieces71139.html