fixed unit ack sound to only happen when *issuing* the order

OpenRa.Game/MoveOrder.cs

@@ -22,7 +22,9 @@ namespace OpenRa.Game
 
 		public override void Apply( Game game, bool leftMouseButton )
 		{
-			if (leftMouseButton) return;
+			if (leftMouseButton) return;
+			if (game.LocalPlayer == Unit.Owner)
+				game.PlaySound("ackno.r00", false);
 			Unit.traits.Get<Traits.Mobile>().destination = Destination;
 		}
 	}

OpenRa.Game/Traits/Mobile.cs

@@ -103,8 +103,6 @@ namespace OpenRa.Game.Traits
 		{
 			if (xy != toCell)
 			{
-				if (game.LocalPlayer == self.Owner)
-					game.PlaySound("ackno.r00", false);
 				return new MoveOrder(self, xy);
 			}
 			return null;