Merges Delta (Kerberos) isolation cells with the Permabrig area

[Onyxarias]

What Does This PR Do

Changes the area for Delta's isolation cells to be the same as the rest of permabrig, as well as removes the now duplicated air alarm and APC, moving the remaining air alarm to a more central location in the hall. closes #21552

Why It's Good For The Game

While the cells had their own unique area, admins were unable to see if antagonists were located inside them using the check antagonists verb, and this fixes that. As well, it brings it in parity to the areas used in the brig on every other map.

Images of changes

Testing

Spun up a test server, put a couple of evil skrell into prison. Checked to make sure they were in there using the check antagonists verb.

Changelog

:cl: tweak: changed delta's isolation cells from the "Isolation" one to the "Permabrig" one tweak: removed a new duplicate air alarm and APC, moved the remaining air alarm /:cl: