Fix Necromancy severity 2 miscast assertions.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8682 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 22, 2009
2UD2HKVSVRC5TM55AB3S2HOFWHCX64Y2XGBTAKMNRHLHMBGTP32AC
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