Friendly horses will avoid any other creature

# Describe the bug
Horses will avoid any other creature by a long way. I've had it happen with random dogs in a field and chicks hatched from eggs.

# Steps To Reproduce
Steps to reproduce the behavior:
1. Spawn a horse and tame it
2. lead it into a field and walk up to any other animal

# Expected behavior
Horses are only scared of things that they see as threats.

# Versions and configuration
- OS: Linux
- OS Version: Kernel 5.4.5-arch1-1
- Game Version: 0.D-10619-g46c0151 [64-bit]
- Graphics Version: Tiles
- Mods loaded: [
Dark Days Ahead [dda],
Disable NPC Needs [no_npc_food],
No Fictional Guns [no_rivtech_guns],
No Flaming Weapons [no_flaming_weapons]
]

No source files, tests, or entry points are mentioned. Start by reproducing the issue with a tamed horse and nearby dogs or chicks, then trace the horse's avoidance behavior. Done means horses avoid creatures identified as threats but do not flee from ordinary nearby animals.

Written by the indexing model from the issue text.