Fix CCVB outer disk boundary sized (#261) (#264)

Previously, this was rMin -> rMax for the inner disks, and rMed -> rMax
for the outer disks. This has been changed to rMin -> rMed and rMin ->
rMax, respectively.

Core/src/Geometry/CutoutCylinderVolumeBounds.cpp

@@ -159,7 +159,7 @@ void Acts::CutoutCylinderVolumeBounds::buildSurfaceBounds() {
   m_outerCylinderBounds =
       std::make_shared<CylinderBounds>(get(eMaxR), get(eHalfLengthZ));
 
-  m_innerDiscBounds = std::make_shared<RadialBounds>(get(eMinR), get(eMaxR));
+  m_innerDiscBounds = std::make_shared<RadialBounds>(get(eMinR), get(eMedR));
 
-  m_outerDiscBounds = std::make_shared<RadialBounds>(get(eMedR), get(eMaxR));
+  m_outerDiscBounds = std::make_shared<RadialBounds>(get(eMinR), get(eMaxR));
 }