Fix ResourceConsumptionChecker, would break on part count change

from jrossignol#708

Author: NathanKell

source/ContractConfigurator/Parameter/VesselParameter/ResourceConsuption.cs

@@ -64,6 +64,7 @@ void FixedUpdate()
                 // Reset counter on vessel change
                 if (partCount != localCount)
                 {
+                    partCount = localCount;
                     checks = 0;
                 }