Account for Ice Storm in _mons_can_smite(), as it's similar to Fire

Storm in many ways.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7920 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on December 23, 2008
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