These occur when an account tries to react with disabled custom emojis.
In both `EmojiReact` and `Like? activities, the activity is discarded.
Signed-off-by: Plastikmensch <plastikmensch@users.noreply.github.com>
Emoji reactions containing custom emojis from
remote instances were assumed to already have
been downloaded and stored in the database.
This might obviously not be the case.