build: update Node.js logo on OSX installer

PR-URL: nodejs#5401
Reviewed-By: Johan Bergström <[email protected]>
Reviewed-By: kahwee
Reviewed-By: fhemberger
Reviewed-By: Сковорода Никита Андреевич <[email protected]>
Reviewed-By: Sakthipriyan Vairamani <[email protected]>

Author: rvagg