Partially fix get_random_armour_type being completely broken (e.g. wizard

hats and caps can get generated again.) get_random_armour_type makes assumptions about the order of armour_type, which were invalidated by r8681; I'm hesitant to touch the order again for fear of breaking something. dolorous, can you check?

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8891 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 4, 2009
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