leader not removed from dead xeno

## Testmerges
#10999: 'Fix of various plane related issues' by Blundir at commit f85a7153c4
#9741: '[TM v0.9] Dancer Praetorian: Buffs and Changes.' by Venuska1117 at commit e9f22468cf
#11823: 'Fixes Minimap Bugs and more' by TrollerNoob at commit 5195ebc3e1
#11075: 'Ticket Panel (Adminhelps & Mentorhelps)' by GeneriedJenelle at commit 4ad8d0cf87
#11889: 'Make the FTL Hijack crash about twice as fast' by noelle-lavenza at commit 65d6af34be
#10414: 'Port: Harm Intent uses Auto-Fire instead of PB' by MistChristmas at commit 8cb88f17ef

## Round ID
32863

## Description of the bug
dead drone FOX has leader status

## What's the difference with what should have happened?
leader should be removed on death

## How do we reproduce this bug?
1) get leader
2) die
3) ???
apparently they got healed by queen as they died

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

## Additional details
- Author: vendingmachine
- Admin: the vendingmachine
- Note: None