Fix _god_fits_artefact() to properly check for good gods' not gifting

cursed artefacts, as opposed to all gods' not gifting them.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4780 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 30, 2008
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