fix: add roofs to the Necropolis

[0Monet]

Purpose of change

Fix because buildings on the surface of the Necropolis have no roofs.

Describe the solution

Add roofs.

Describe alternatives you've considered

Do nothing.

Testing

none

Additional context

none

[autofix-ci[bot]]

Autofix has formatted code style violation in this PR.

I edit commits locally (e.g: git, github desktop) and want to keep autofix

1. Run git pull. this will merge the automated commit into your local copy of the PR branch.
2. Continue working.

I do not want the automated commit

1. Format your code locally, then commit it.
2. Run git push --force to force push your branch. This will overwrite the automated commit on remote with your local one.
3. Continue working.

If you don't do this, your following commits will be based on the old commit, and cause MERGE CONFLICT.

[Zlorthishen]

check out the post office map as an example of how to add some interesting roof clutter.