4.12.2 de-bugging

[Notorious M.i.G.]

Taken in the SB-2, though it also happened in the Pe-8 and I assume also happens in the other bombsights. The ring is too big for the screen res, so I can't actually see when the loop and arrow overlap if it's anywhere in the 6 o'clock area of the sight - which is where it ends up a lot of the time in the SB-2.