ScatteringSimulation::simCoordSystem simplify

Sim/Simulation/ScatteringSimulation.cpp

@@ -40,9 +40,7 @@ ScatteringSimulation::~ScatteringSimulation() = default;
 
 const ICoordSystem* ScatteringSimulation::simCoordSystem() const
 {
-    auto* const det2D = dynamic_cast<const IDetector*>(getDetector());
-    ASSERT(det2D);
-    return det2D->scatteringCoords(beam());
+    return m_detector->scatteringCoords(beam());
 }
 
 //... Overridden executors: