Go fmt
Fix bug with some non-Steam games

Apprantely one of the topmost bits of the CRC32 should always be on. So
about half of the games would have a wrong id and thus no image. Fix
thanks to
https://github.com/scottrice/Ice/blob/7130b54c8d2fa7d0e2c0994ca1f2aa3fb2a27ba9/ice/steam_grid.py