[Fixes] more directional photography issues
Added the following paths to the directional exceptions of Get Flat Icon, so they'll now appear properly rotated on pictures.
- /obj/machinery/door/firedoor/border_only (the new firelocks)
- /obj/item/projectile (projectiles, duh)
- /obj/effect/beam/emitter (the emitter beams)
I'm not sure whether it'll fix lasergun beams on pictures since those are overlays on the floor though.