Reset Ready status of players in Lobby when options change

Addresses #11274

OpenRA.Game/Network/UnitOrders.cs

@@ -302,7 +302,10 @@ namespace OpenRA.Network
 						{
 							var strings = node.Key.Split('@');
 							if (strings[0] == "GlobalSettings")
+							{
 								orderManager.LobbyInfo.GlobalSettings = Session.Global.Deserialize(node.Value);
+								orderManager.IssueOrder(Order.Command("state {0}".F(Session.ClientState.NotReady)));
+							}
 						}
 
 						SetOrderLag(orderManager);