Cataclysm-dda: Subway corners and horizontal straight courses spawn misaligned occasionally

[BorkBorkGoesTheCode]

Game version:
0-c-27466
Operating system:
windows 10
Tiles or curses:
tiles

Expected behavior

Subway tunnels are always aligned.

Actual behavior

Subway corners occasionally spawn rotated 90 degrees misaligned. Straight courses spawn misaligned every few maps. Horizontal courses are affected.

Steps to reproduce the behavior

Create a new world in the affected experimental and walk in a subway tunnel.

[ZhilkinSerg]

This is due to overmap terrains in subway_tunnels.json which are placed occasionally, but not being rotated.

Should be fixed in #23069.