Matchmaking adjustment: when autofilled, ensure we don't face premades while solo

That's to say, if Autofill is enabled and you are Autofilled into a role that you've not selected, then adjust it so that you will never have to face a full premade or multiple premades team with four other solo players.

It's ridiculous that the current system will both give you a different role AND match you against premades alongside solos. That's just stacking disadvantages and makes for very poor quality games, as you're against superior communication/cooperation in a role you don't necessarily feel comfortable in.