Fix #1379,#1413 (hydro tray parts)

Changed default ```machinery/hydroponics/Del()``` behavior to delete parts as well.
```Destroy()``` still only deletes the tray.
Fixes #1379 (transforming into apiary spawns parts)
Fixes #1413 (cleaning soil spawns parts)

This is band-aid fix.
Machines need to be refactored, and it's probably not appropriate for a pile of soil to be a machine.