[Raffle] Option To ReRoll A Winner Out Of Multiple

[Jacob-1999]

I hope the title makes sense, if not, I'll explain it here of course. With the command [p]raffle reroll <channel> <message_id>, it would be nice if we're able to reroll a certain number of winners out of a group. For example if I had a raffle with 4 winners and 3/4 claimed, instead of rerolling all 4 winners, I would like to reroll just 1 winner from those 4.

Maybe [p]raffle reroll <channel> <message_id> [num]