get rid of Sellable.Selling state

OpenRA.Mods.RA/Sellable.cs

@@ -22,11 +22,9 @@ namespace OpenRA.Mods.RA
 
 	public class Sellable : IResolveOrder
 	{
-		[Sync] public bool Selling = false;
-
 		public void ResolveOrder(Actor self, Order order)
 		{
-			if (order.OrderString == "Sell" && !Selling)
+			if (order.OrderString == "Sell")
 			{
 				var capturing = self.TraitOrDefault<Capturable>();
 				if (capturing != null && capturing.CaptureInProgress)
@@ -35,8 +33,6 @@ namespace OpenRA.Mods.RA
 				if (!self.Trait<Building>().Lock())
 					return;
 
-				Selling = true;
-
 				foreach( var ns in self.TraitsImplementing<INotifySold>() )
 					ns.Selling( self );