emulators/yuzu: unbreak fetch after 8042b641840f

Failover between mirrors doesn't work if file exists but is different.

> Attempting to fetch https://api.yuzu-emu.org/gamedb/?dummy=/yuzu/compatibility_list.json

[...]

> SHA256 Checksum mismatch for yuzu/compatibility_list.json.

[...]

> Giving up on fetching files: yuzu/compatibility_list.json

Reported by: pkg-fallout

(cherry picked from commit beb378a9cf7dc275aaa15d74465ff944b2cf49c3)