Don't affect accuracy or damage in TSO artefacts, either, since those

don't change from the non-randart version.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4293 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 17, 2008
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