Fix potential assertion when doing an ice miscast in arena mode (e.g. 20

chaos spawns vs. 20 glowing shapeshifters), by using the target parameter properly.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8258 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 5, 2009
5JVV66G3WOAZGTBUHUX5CCDKLSTDNGREFT46SGU3CGKJL65FEGZQC
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