fix #H2582 - seemingly angry peaceful vault guard

fix #H2582 - seemingly angry peaceful vault guard

Another one from nearly 7 years ago.  Hero kicked embedded gold out
of a wall while following the guard away from the vault and got
  "The guard calms down and picks up the gold."
and player thought it was odd because the guard was peaceful.  It is
odd, but guards have an agitation state (0..7) when peaceful and it
is always non-zero when this event occurs.  Suppress the "calms down"
part unless the agitation is close to making the guard turn hostile.
[Agitation is set to 5 after that event, so it isn't very calming.]

Also, the guard was picking up gold from underneath the hero while
two steps away.  Move him adjacent (although it doesn't knock other
monsters out of the way if there's no room) prior to the message,
then back again after.  That's how if works for gold that's not at
the guard's location and not at the hero's location, although that
case does knock another monster out of the way if one is on the gold.