Fix house_08 mapgen errors

[dseguin]

Summary

None

Purpose of change

It looks like #57446 introduced some mapgen issues. This is causing CI tests to fail when the No Hope mod is loaded.

Examples of failed GHA runs:

https://github.com/CleverRaven/Cataclysm-DDA/runs/6378274579
https://github.com/CleverRaven/Cataclysm-DDA/runs/6378882185

Describe the solution

Use palette definitions, mainly using the same definitions as the existing house_08 OMT (standard_domestic_palette and standard_domestic_palette_abandoned).

I also moved the new terrain and furniture defs to a separate palette for consistency.

Describe alternatives you've considered

Testing

Ran the offending test:

./tests/cata_test --rng-seed time --mods=dda,no_hope '~*'

Additional context

(How did the original PR pass all tests?)