Detonations don't get removed when structures are transferred

[eve-n0rman]

If a structure is transferred from a corp with keys in the app to a corp not in in the app, previously scheduled detonations still show up in the timers page. Presumably we're missing some logic around moons that disappear from the API. See moon IDs 4101 and 4316 as examples, which were transferred from -BPOS to other alliance corps not in the database.