fix deadlife dust display twice in 'add gas' debug menu

Source/PerformanceFish/GasGridOptimization.cs

@@ -1,4 +1,4 @@
-// Copyright (c) 2023 bradson
+// Copyright (c) 2023 bradson
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at https://mozilla.org/MPL/2.0/.
@@ -500,7 +500,7 @@ public sealed class GasGridOptimization : ClassWithFishPrepatches
 		{
 			var gasDefs = DefDatabase<GasDef>.AllDefsListForReading;
 
-			for (var i = 3; i < gasDefs.Count; i++)
+			for (var i = START_INDEX; i < gasDefs.Count; i++)
 			{
 				var gasDef = gasDefs[i];