Bargain was never expiring (1753740.)

Bargain no longer gives a duration of 0.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1859 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on July 14, 2007
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