roof innawood caves

[PatrikLundell]

Summary

None

Purpose of change

Fix #76095, i.e. Innawood caves lacking roofs.

Describe the solution

Update the Innawood caves according to the same principles applied to vanilla caves.

Describe alternatives you've considered

Testing

• Created an Innawood world and random character.
• Debug spawned 9 innawood caves.
• Teleported to them and examined them.
  
  
  This is not the full set of caves, but the same processing was performed on all of them. That, in combination with there not being any errors reported on load should provide a good confidence the changes work.

Additional context