Permanents owned by a player who conceded by disconnect are not fully cleaned up

I closed the client to concede the game after [getting stuck in a replacement effect loop](https://github.com/magefree/mage/issues/7603) and the Seedborn Muse that an opponent had stolen remained in play under their control. They were given the option to attack with it (and chose not to, or we'd know if it ) but it did not untap their permanents during the next player's untap step; this extra blocker allowed them to survive an extra turn and cast a boardwipe that they shouldn't have been able to.