If player throws a wielded aklys and it fails to return, and quiver
is empty when picking it back up, don't put it into that slot because
it needs to be wielded to achieve best throwing effect. A player who
had wielded it and was using 'f' to throw it might not notice that
it isn't returning until it hasn't returned several times. Moot if
quiver already has some missile readied. Don't autoquiver even if
some other weapon is wielded because that might have been done just
to go retrieve the aklys.
The game doesn't keep track of whether a previously thrown item was
wielded at the time, and shouldn't be changed to auto-wield in such
situation. Leaving quiver empty so that player is prompted for what
to throw is sufficient.
Fixes#540
f7436fd02d