in the air. can_reach_floor() was changed relatively recently
to return False if hero was held by a monster. It wasn't
necessarily because the monster was lifting him or her off the
floor though. Restricted movement could produce same effect.
Change the new behavior to only happen when holder has used a
hug attack, so that being held by a fungus or mimic doesn't
prevent access to the floor.
This may need to be revisited because the idea that the hero's
arms have been pinned by a hugging monster contradicts the
ability to attack that monster. However, it matches the long-
standing inability to attack any other adjacent monster in
that circumstance.
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