[exploit] Flashbangs vend twice, which you can then put back and vend for infinite flashbangs on HVH

## Testmerges
#10830: 'CMLIVE!™️' by hry-gh at commit 858d10d4d6
#10883: 'Blocks tiles you cannot view while looking up' by Git-Nivrak at commit 5d0d58b9f6
#10926: 'Medals Overhaul' by realforest2001 at commit 7df4ad80f9
#7242: 'Yautja Clan TGUI Menu' by realforest2001 at commit 2381ac0a1b
#10999: 'Fix of various plane related issues' by Blundir at commit f85a7153c4
#10375: 'Corporate Bodyguard' by realforest2001 at commit d0c7d476db
#10964: 'Fixes for negative power and APC polish' by Drulikar at commit dfcda67553
#11024: 'Announcement garble w/o coms and stars_decode_html fix' by Drulikar at commit 4531663988
#10937: 'Various deconstruction do_after exploit fixes and cleanup' by Drulikar at commit 1c988dda9a
#11042: 'Emissive Pred Masks' by realforest2001 at commit 282f11a189

## Round ID
30818

## Description of the bug
title. Vend a flashbang which vends a seperate HVH flashbang, you can then put back the flashbang to vend for infinite non HVH flashbangs.

## What's the difference with what should have happened?
No duplicating flashbangs

## How do we reproduce this bug?
1. Be HVH
2.Vend flashbang
3. See two flashbangs vended
4. Put back flashbang into vendor
5. Repeat
6. See error.

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

## Additional details
- Author: Onetoughcreampuff
- Admin: Steelpoint
- Note: None