Fix: Build error after simulation header cleanup

Making the geometry state's geometry public to remove
the accessors didn't work without the constructor.

source/blender/blenkernel/BKE_simulation_state.hh

@@ -19,6 +19,7 @@ class SimulationStateItem {
 
 class GeometrySimulationStateItem : public SimulationStateItem {
  public:
+  GeometrySimulationStateItem(GeometrySet geometry);
   GeometrySet geometry;
 };
 

source/blender/blenkernel/intern/simulation_state.cc

@@ -15,6 +15,11 @@
 
 namespace blender::bke::sim {
 
+GeometrySimulationStateItem::GeometrySimulationStateItem(GeometrySet geometry)
+    : geometry(std::move(geometry))
+{
+}
+
 PrimitiveSimulationStateItem::PrimitiveSimulationStateItem(const CPPType &type, const void *value)
     : type_(type)
 {