[#16252911] remove inbound links on delete node
[#16252911] remove inbound links on delete node

Was typo, outbound links were being detelted twice.

BUG: links are not deleted from saved data when they disappear from the diagram
https://www.pivotaltracker.com/story/show/16252911
concord-consortium/mysystem_sc,concord-consortium/mysystem_sc,concord-consortium/mysystem_sc