Fix typo in mons_thrown_object_destroyed() that let non-missiles instead

of missiles be destroyed (oops).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3804 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on March 22, 2008
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