Add a field to the payment option editor for CVC numbers

This is a very minor thing I'm surprised isn't in Discord yet. Every time my card updates, my credit union changes the expiration date and CVC number on the back, so naturally, I'd want to update that on my Discord account. Problem is, I can't, and have to delete my old card info and add it back, and if I have an active subscription for Nitro, I can't do that without adding another method first, making it my subscription method, then delete my old card, get the new one in, and switch back.

This simple fix would just make things so much easier on us, and let us fix a missed payment in seconds. It's a very minor issue, I know, since not everyone uses Nitro or even bothers adding their card at all, but it'd be nice for those of us that do.