refactor!: material: double for pathCorrection

Core/include/Acts/Material/AccumulatedMaterialSlab.hpp

@@ -46,7 +46,7 @@ class AccumulatedMaterialSlab {
   ///
   ///  Vacuum steps with a non-zero thickness can be added to account for holes
   ///  in material structures.
-  void accumulate(MaterialSlab slabAlongTrack, float pathCorrection = 1);
+  void accumulate(MaterialSlab slabAlongTrack, double pathCorrection = 1.);
 
   /// Use the accumulated material to update the material variance
   ///

Core/src/Material/AccumulatedMaterialSlab.cpp

@@ -12,10 +12,10 @@
 #include "Acts/Material/detail/AverageMaterials.hpp"
 
 void Acts::AccumulatedMaterialSlab::accumulate(MaterialSlab slab,
-                                               float pathCorrection) {
+                                               double pathCorrection) {
   // scale the recorded material to the equivalence contribution along the
   // surface normal
-  slab.scaleThickness(1 / pathCorrection);
+  slab.scaleThickness(static_cast<float>(1. / pathCorrection));
   m_trackAverage = detail::combineSlabs(m_trackAverage, slab);
 }