Proposes a fix for #5224

Proposed fix for https://github.com/Baystation12/Baystation12/issues/5224. 
When an air alarm detects dangerous conditions, if the alert was triggered by dangerous pressure levels then the environmental mode will be set to off, so the room will not fill.

Once engineers or atmos techs come by and fix the breach, then they can reset the environmental mode manually or remotely. If no one comes by to fix the breach, then the vents being off shouldn't be a problem.