Update cut_to_disk.h

move headers to cpp

Former-commit-id: 697195a76480d1b7e1e0e6a801f0bc489a55fa8f

include/igl/cut_to_disk.h

@@ -5,10 +5,6 @@
 #include <Eigen/Core>
 
 #include <vector>
-#include <map>
-#include <set>
-#include <deque>
-#include <algorithm>
 
 namespace igl
 {