[1.7.3] Typo in the load hooks for Forbidden Cults

[Erenion]

The Occult Egress code to access the Entropic Void is supposed to appear in the Slumbering Caves, the final zone of Embers of Rage.
However, in the hooks, the zone name is incorrectly spelled "orcs+sumblering-caves", leading to the symbols not appearing.

[nsrr]

Fix submitted