Build failed because of nscontrolkeymask

[Vagish Vela]

https://developer.apple.com/reference/appkit/nscontrolkeymask seems deprecated and is used on https://github.com/Neo11/ChitChat/blob/master/WhatsMac/WAMApplication.swift#L22

• Figure out what we were checking for and either remove (if it doesn't impede on functionality) or replace

[Fábio Salata]

On it.