Allow soul enslavement to work properly on drowned monsters.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8732 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 24, 2009
5VTEA63UZKKR7A6GEBWJLTL3C3YMTA7DFQ6KSWJO4M2VMSQFTWNQC
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