Fix: remove obsolete import of skeletonlist module
Fix: remove obsolete import of skeletonlist module

Having this import still in, caused a missing module error.

Thanks to Felix von Zadow for this pointer.

htem/CATMAID,fzadow/CATMAID,fzadow/CATMAID,htem/CATMAID,fzadow/CATMAID,fzadow/CATMAID,htem/CATMAID,htem/CATMAID