Fix ProcessOrders not always being called after leaving a waiting order

Fixes conditional order loop on leaving a depot

src/ship_cmd.cpp

@@ -352,7 +352,7 @@ static bool CheckShipLeaveDepot(Ship *v)
 	if (!v->IsChainInDepot()) return false;
 
 	if (v->current_order.IsWaitTimetabled()) {
-		v->HandleWaiting(false);
+		v->HandleWaiting(false, true);
 	}
 	if (v->current_order.IsType(OT_WAITING)) {
 		return true;