Defender sprite doesn't update when stunned if fortified or crest down

## Testmerges
#7850: 'Acid Runner: Acid gen cap' by TheManWithNoHands at commit 267636ef4a
#7607: 'Warden Praetorian rework (tm)' by Red-byte3D at commit af402858bf
#7650: 'Yet Another Attempt To Fix Vamp' by ihatethisengine at commit eaf54699e6
#8226: 'Project ARES: Turret IFF Controls' by realforest2001 at commit 87114a46ac
#7023: 'Research Rework Part Two: The Contract System.' by kiVts at commit 14796a8a05
#7816: 'Hostile Survivor Rework Revival' by BOBAMAx at commit cdd857804b
#8026: 'Xenomorph Endgame changes' by Git-Nivrak at commit 3c6c29654b
#7320: 'Intel Detector fix' by blackcrystall at commit 5eef44e852
#8277: 'Adds a shotgun choke for the M37A2' by VileBeggar at commit 536721a20a
#8281: 'Stat logging improvements' by Zonespace27 at commit 61858733cc
#8114: 'Multiz' by Git-Nivrak at commit bb8c521b1d

## Round ID
26157

## Description of the bug
title
might occur with charger crusher as well

## What's the difference with what should have happened?
It should update to knocked down sprite

## How do we reproduce this bug?
Be defender
Fortify / Lower Crest
Get stunned
Sprite stuck

## Attached logs
```
N/A
```

## Additional details
- Author: Nivrak
- Admin: Cyberdie
- Note: None