for monsters that haven't died, when being removed from play to keep
them out of bones.
Reported by copperwater: if the quest nemesis was present on a level
being saved as bones, it was removed from the map to keep it out of
the bones level but the quest feedback for nemesis death was given
in the process. Would happen for blessed genocide of "*" too. (It
didn't happen for #wizmakemap and I'm not sure why.)
This was an unintended side-effect of moving some common stuff from
mondead() and mongone() into m_detach(). The quest feedback isn't
actually common to both. Instead of moving that back, pass a flag
that m_detach() can use to determine which routine called it.
Fixes#1029
92a993a0b6