Force monsters generated with only a missile launcher to wield the launcher

when being generated (instead of switching to it before firing the first shot).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1816 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on July 9, 2007
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