Fix the second of a couple of minor things I noticed when viewing
that guy's ttyrec about a hidden inventory item which turned out to be
scrolls of scare monster on the used-up items section of his shop bill.
He had a lot of scroll prices which started as $X00 and were changed
to $Y99 due to integer division roundoff when being hit with a 1/3 price
increase for unID'd items followed by 1/2 price increase for low charisma:
100 -> 133 -> 199
200 -> 266 -> 399
Forcing things to round up instead of truncate would help in some cases
but yield $Z01 in others. Rather than doing that, this accumulates the
adjustment factors and then uses them to make one calculation which gives
a better result:
100 -> 200
200 -> 400
Other values and/or other adjustments might not work out so well, but I
don't think they'll ever become prices which look worse than before.
For a single increase of 1/3, 100 still yields 133 but 200 now gives 267
(so ends up differing from the combined price for two 100->133 items).
c98133ac80