Simple change to fix Skirmish 2v2 arena.

i know not a lot of people play or care about skirmish 2v2, but if you do play it, you encounter a problem, of empty games, that is 1 or 2 players constantly leaving the match before it starts. In battlegrounds, or ranked 3v3 you get deserter debuff if you leave the match, even in dungeon finder you get debuff. People should get deserter debuff in skirmish 2v2 arenas too, to reduce leavers and griefers and overall weird people who join skirmish arenas to reset cooldowns or just to grief people or god knows whatever other reason. There is a small community that enjoys 2v2 skirmish, and we would appreciate this simple change to improve the experience of everyone.