Fix [1944356]: randart_is_redundant() now uses the correct property for

rings of see invisible.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4271 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 16, 2008
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