Multiple item workOrder work

src/engine/gameManager/ForgeManager.java

@@ -100,9 +100,9 @@ public enum ForgeManager implements Runnable {
         workOrder.production_cost_total.putAll(workOrder.production_cost);
         workOrder.production_cost_total.forEach((key, value) -> workOrder.production_cost_total.compute(key, (k, v) -> v * workOrder.total_to_produce));
 
-        // Single item rolls are total_to_produce of 0;
+        // Single item rolls are msg_size of 0;
 
-        if (workOrder.slots_used > 0 && workOrder.total_to_produce == 0)
+        if (workOrder.slots_used > 0 && workOrder.msg_size == 0)
             workOrder.slots_used = 1;
 
         // Create in-memory items and add to collections