[crossfire] Pickup issues

[Nicolas Weeger]

Hello.

The query_cost function was changed part of selling / buying
improvement. But now the pickup ratio, which uses this function to
estimate the item's price, grabs much more items than before.
Should we try to fix to keep previous behaviour? Or just ignore & leave
like that?
(with ratio 75 [max], i picked all items in dragonmountain except 2
really heavy armors lol)

Ryo