Highlights games you already own on Steam, on other sites. Modified from https://greasyfork.org/scripts/16105-bundle-helper/
Shamelessly copied from Dillon Regimbal 's wonderful Bundle Helper 2.04 https://greasyfork.org/en/scripts/403878-bundle-helper
Fanatical Pick and Mix stopped working because apparently Fanatical changed how it stores the steam ids in react.
More fixes to come soon, hopefully
