Collapsed Nodes do not move with their functions

When you create a function and collapse nodes within it, the collapsed nodes to not follow the function category switch.

I also noticed that when you move the function around that has the collapsed node within it, the category is brought to the top. This is minor but could definitely cause some confusion.

This was also checked on 4.8 2506329

1. Open a blueprint
2. Create 3 new functions and 3 categories
3. Open 1 function up and add 2 print-strings
4. Collapse the print-strings together
5. Re-categorize the function