Dropship "Unload ammo bug"

## Testmerges
#8959: 'Speech bubble update' by Blundir at commit 42361441ef
#7703: 'Hivelord Strain: Designer [Ver. 0.5]' by Venuska1117 at commit 8e9593b401
#7023: 'Research Rework Part Two: The Contract System.' by kiVts at commit 314047f74a
#7511: 'Weyland-Yutani Intranet Terminal' by realforest2001 at commit 95701e6ec2
#8226: 'Project ARES: Turret IFF Controls' by realforest2001 at commit 36c550d70f
#7296: 'Remote Monitoring Cameras' by realforest2001 at commit 09065ead82

## Round ID
27352

## Description of the bug
If you unload ammo from a dropship and time it with picking up another ammo it deletes the ammo you unload

## What's the difference with what should have happened?
Idk, it should not delete it

## How do we reproduce this bug?
1) start unload ammo
2) as it finishes just go and grab another ammo pack
3) done

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

## Additional details
- Author: Ovechka
- Admin: SmellyHippie
- Note: None