Revert "[Crash] Fix spell in AESpell related to beacons (#3659)"

This reverts commit 0b452f4ec1.

zone/entity.cpp

@@ -5850,13 +5850,3 @@ void EntityList::DamageArea(
 		}
 	}
 }
-
-void EntityList::RemoveFromBeacons(Mob *p_mob)
-{
-	for (auto it = beacon_list.begin(); it != beacon_list.end(); ++it) {
-		if (it->second == p_mob) {
-			beacon_list.erase(it);
-			break;
-		}
-	}
-}