Fix [2581197]: Make glow status consistent with magical contamination by

fixing off-by-one errors when checking the latter.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9113 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on February 17, 2009
B4S3Q6BNEJGCIC2LVLYM4FUHMLU3A7LXNOSP6UY5YACVVQHPKWOAC
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