Summary

SUMMARY: Bugfixes "add enchanted rings back to dragon's lair loot"

Purpose of change

Due to some unknown changes, the dragon's lair didn't use his "treasury" item group for the final room.
It used the item group for the random objects in the lair, before the "treasury" final room.
Since the enchanted rings are in the treasury item group, they never spawned in the lair.

Describe the solution

Fix this problem by using the item group for the treasury.
This is also on par with the current DDA version, but I couldn't find the commit that resolved that, only the commit that introduced the bug.

Testing

• for testing, you might want to increase the probability that a ring appears, because it seems quite low.
• then reveal the map, go one tile below ground 0 and search for white "%" signes
  
• teleport here and verify that at least one ring spawned