LZ turrets are able to be placed onto unreachable shipping containers on bigred

## Testmerges
#8365: 'Hellhound rework and re-sprite' by Red-byte3D at commit 24c30a80e4
#8273: 'Smartscope now uses alt IFF.' by Detective-Google at commit 61e30f00b7
#7614: 'Loadout Customization - Items expanded & more...' by Zenith00000 at commit 9f6e36c8d3
#8292: 'Update to Lower Medbay - Complete redesign' by LC4492 at commit c10ae55cd7
#8369: 'de-laggies the unban panel' by hry-gh at commit 4f68835637
#8442: 'Removes devour, replaces it with haul. #2737 Revival' by casperr04 at commit 1219b9d6a0
#7645: 'adds poll subsystem, entities and ui' by hry-gh at commit ddd2f66fd9

## Round ID
26385

## Description of the bug
Title, turret was found placed on a shipping container on a unreachable tile, per https://cdn.discordapp.com/attachments/846705223165804576/1339412908777541704/image.png?ex=67aea0fa is=67ad4f7a hm=d6f7adaea685b3ebb40440568646cffc28ca5692cfa0227675e9ea364fca2eb3

## What's the difference with what should have happened?
Turret should not spawn somewhere it cant be reached, or infact it shouldnt be spawning on a blocked tile for that matter

## How do we reproduce this bug?
1. Have map be bigred
2. Get lucky
3. See error

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

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