Exclude PlanetWars from MM abort-on-unready logic, fix #3027

PW battles have IsMatchMakerBattle=true but should not be aborted
when players fail to place start positions. PW games should proceed
with whoever is present.

Author: Licho1

ZkLobbyServer/ServerBattle.cs

@@ -1341,7 +1341,7 @@ private void spring_BattleStarted(object sender, SpringBattleContext e)
             try
             {
                 StopVote();
-                if (IsMatchMakerBattle && e.PlayersUnreadyOnStart.Count > 0 && e.IsTimeoutForceStarted)
+                if (IsMatchMakerBattle && Mode != AutohostMode.Planetwars && e.PlayersUnreadyOnStart.Count > 0 && e.IsTimeoutForceStarted)
                 {
                     string message = string.Format("Players {0} did not choose a start position. Game will be aborted.", e.PlayersUnreadyOnStart.StringJoin());
                     spring.SayGame(message);