wrong path for marching cubes

Former-commit-id: f8fa4d9c7d4b3c2717bb024bd3219eebb4acf00e

include/igl/copyleft/swept_volume.cpp

@@ -2,7 +2,7 @@
 #include "../swept_volume_bounding_box.h"
 #include "../swept_volume_signed_distance.h"
 #include "../voxel_grid.h"
-#include "../marching_cubes.h"
+#include "marching_cubes.h"
 #include <iostream>
 
 IGL_INLINE void igl::copyleft::cgal::swept_volume(