Graboid in Car

# Describe the bug

If you are near a graboid and open your car door, it can come into your car. Once it's in, NPC AI will break if they try to fight it, showing an error message. The graboid seems to get stuck in the car and can't move.

# Steps To Reproduce

1) Be in a car near a graboid
2) Open the door
3) Make noise so it comes to attack you
4) Once it's in the open doorway, it's stuck.
5) Try to have an NPC attack it for added breakage

# Expected behavior

Graboids probably shouldn't be able to stand in tiles covered by car parts.

# Versions and configuration

- OS: Windows
- OS Version: 10.0 2004
- Game Version: 0.E-10114-gd55d4a1 [64-bit]
- Graphics Version: Tiles
- Game Language: English [en]
- Mods loaded: [
Dark Days Ahead [dda],
Disable NPC Needs [no_npc_food],
Bionic Professions [package_bionic_professions],
Stats Through Skills [StatsThroughSkills],
No Fungal Monsters [No_Fungi]
]

Start by reproducing the issue with the listed car, graboid, and NPC attack steps on the specified game version. Trace the interaction between car-part tiles, graboid movement, and NPC attacks; done means the graboid cannot become stuck in covered tiles and NPC combat no longer produces the reported error.

Written by the indexing model from the issue text.