Encounter rooms in hallways generate extremely rarely.

Steps to reproduce:

1. Run /place structure minecraft:trial_chambers
2. Observe the structure and try to find Encounters
3. Repeat several times

Observed result:
Encounter rooms are extremely rare. you may not see any of them even after looking through dozens of structures.

Expected result:
Encounter rooms would generate at a reasonable frequency.

Cause:
In hallway.json, you can see that the weight of each chamber is 150, while the weight of encounters is 1, which results in encounters generating way less often than chambers. To fix the issue, the weight of encounters can be increased to a more reasonable number (this may very rarely result in multiple encounters generating back-to-back, but that should be fine).