Fix [2011384]: Make Xom's divine lightning conditional on dangerous

monsters' being nearby again.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6413 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on July 5, 2008
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