Correct parameter name as per recommendation.

Author: peternewell

Source/Orts.Simulation/Simulation/RollingStocks/MSTSSteamLocomotive.cs

@@ -823,7 +823,7 @@ public override void Parse(string lowercasetoken, STFReader stf)
                 case "engine(enginecontrollers(dampersfront": DamperController.Parse(stf); break;
                 case "engine(enginecontrollers(shovel": FiringRateController.Parse(stf); break;
                 case "engine(enginecontrollers(firedoor": FireboxDoorController.Parse(stf); break;
-                case "engine(enginecontrollers(steambooster": SteamBoosterController.Parse(stf); SteamBoosterControllerFitted = true; break;
+                case "engine(enginecontrollers(ortssteambooster": SteamBoosterController.Parse(stf); SteamBoosterControllerFitted = true; break;
                 case "engine(effects(steamspecialeffects": ParseEffects(lowercasetoken, stf); break;
                 case "engine(ortsgratearea": GrateAreaM2 = stf.ReadFloatBlock(STFReader.UNITS.AreaDefaultFT2, null); break;
                 case "engine(superheater": SuperheaterFactor = stf.ReadFloatBlock(STFReader.UNITS.None, null); break;