Remove scrolls of fog from the list of useless items, since they can be

used to interrupt line-of-sight.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5339 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on May 30, 2008
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