fix chem damage

src/npc/surgery/organFarm.js

@@ -133,7 +133,7 @@ App.Medicine.OrganFarm.implant = function(slave, type, actionIndex) {
 	A.implant(slave);
 	surgeryDamage(slave, A.healthImpact);
 	if (V.organFarmUpgrade >= 2) {
-		slave.chem -= 20;
+		slave.chem += 20;
 	}
 
 	App.Medicine.OrganFarm.removeOrgan(slave, type);