WY station lab flash

## Testmerges
#8365: 'Hellhound rework and re-sprite' by Red-byte3D at commit aca9910a2c
#8273: 'Smartscope now uses alt IFF.' by Detective-Google at commit 61e30f00b7
#7614: 'Loadout Customization - Items expanded & more...' by Zenith00000 at commit a234ad329c
#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 093e9ba686
#7645: 'adds poll subsystem, entities and ui' by hry-gh at commit ddd2f66fd9
#8470: 'faster cellauto explosions' by jupyterkat at commit 8f5705eeb1
#8114: 'Multiz' by Git-Nivrak at commit d701add153

## Round ID
26422

## Description of the bug
the flash inside the lab containment cell also flashes the user if they are next to the cell.

## What's the difference with what should have happened?
It shouldn't reach outside the cell

## How do we reproduce this bug?
spawn on the WY ERT station
Go next to the window, which is also next to the PC of the containment cell
Flash yourself with the PC

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

## Additional details
- Author: BorisTheLove
- Admin: Segrain
- Note: None

Start by reproducing the issue on the WY ERT station: stand next to the containment-cell window and PC, then flash yourself with the PC. Trace the containment-cell flash behavior and verify that a user outside the cell is no longer flashed.

Written by the indexing model from the issue text.