Bug#919835: mgba; AppStream metadata isn't being used because of its license

[Jeremy Bicha]

Sergio, please take a look at my merge proposal to fix this issue. We
need your approval to merge it.

https://salsa.debian.org/games-team/mgba/merge_requests/2

You can get your own Salsa account at https://signup.salsa.debian.org/
Let the Debian Games team know when you have an account so that we can
give you permissions to update your packages.

Thanks,
Jeremy Bicha