use correct class instead of base class

GUI/Model/To/DomainSimulationBuilder.cpp

@@ -112,18 +112,13 @@ void addBeamDivergencesToScan(const BeamItem& beam_item, AlphaScan& scan)
         scan.setAngleResolution(*resolution);
 }
 
-void setSimulationOptions(ISimulation* simulation, const SessionItem& item)
+void setSimulationOptions(ISimulation* simulation, const SimulationOptionsItem& optionItem)
 {
-    ASSERT(item.modelType() == SimulationOptionsItem::M_TYPE);
-
-    if (const auto* optionItem = dynamic_cast<const SimulationOptionsItem*>(&item)) {
-        simulation->options().setNumberOfThreads(optionItem->numberOfThreads());
-        if (optionItem->useMonteCarloIntegration())
-            simulation->options().setMonteCarloIntegration(true,
-                                                           optionItem->numberOfMonteCarloPoints());
-        simulation->options().setUseAvgMaterials(optionItem->useAverageMaterials());
-        simulation->options().setIncludeSpecular(optionItem->includeSpecularPeak());
-    }
+    simulation->options().setNumberOfThreads(optionItem.numberOfThreads());
+    if (optionItem.useMonteCarloIntegration())
+        simulation->options().setMonteCarloIntegration(true, optionItem.numberOfMonteCarloPoints());
+    simulation->options().setUseAvgMaterials(optionItem.useAverageMaterials());
+    simulation->options().setIncludeSpecular(optionItem.includeSpecularPeak());
 }
 
 std::unique_ptr<GISASSimulation> createGISASSimulation(std::unique_ptr<MultiLayer> multilayer,