[bot] Accept TOS message on app command use, if no player is registered.

### Self-hosting

Official Ballsdex bot

### Description

If a user tries to run a command, and they aren't registered in the bot, instead of the regular response they would get from the app command, they get the accept TOS embed, the one currently used in /config channel.

(This is from a suggestion in the main server, https://discord.com/channels/1049118743101452329/1336299837502783619)