The k=2..8 alignment steps always rotated via a halfway "approach"
angle before the 45 deg target, to let the operator watch the sample
sweep through in live view. That's only useful when keep_shutter_open
is True; with the shutter closed nobody sees the intermediate move, so
just rotate straight to the target angle in that case.
Also bump the OMNY/FlOMNI post-fshopen() freeze-frame delay in
update_frame() from 0.5s to 1s to match LamNI's, for consistent
behavior between the two plugins.