2v2 ladder won't start because it thinks 1 player is still in a game

[NyxVxyN]

2v2 can't queue

To reproduce
Steps to reproduce the behavior:
Player plays game, not all participants have disconnected

Expected behavior
Game should recognise that player is no longer in the game even if other participants are still connected or have not closed the score screen

OS
Windows

[Sheikah45]

This requires a server change as the server tells the client when the player is in a game. Currently it only sends a game end message when the game is over for all players

[Askaholic]

Duplicate of #703