Don't add player throwing skill to monster damage

(cherry picked from commit 9d5d16d2908cffc58809283c82be09068f757ded)
Don't make monsters 'flee' seemingly at random (7645)

Specifically, ranged monsters would flee a few spaces after you
went upstairs, to minimize stairdancing vs centaurs and such.
(Good!) If you waited a few turns before going back down, they'd
be left in the 'fleeing' state, which looked extremely strange to
players. (Bad!) This fixes the latter.

(cherry picked from commit fc927f3fcf1de94e222884456492093f8e1a79fd)