Clean up armor subtype handling again. There's other code that relies

on the assumption that the normal armours are in ascending order by AC, from ARM_ROBE to ARM_PLATE_MAIL, so it seems okay to use that for now.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8903 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on February 5, 2009
WU3E44CEYAC6TWW7M62DXXEJGZO4VJ5TOJALOLAQUNHJGCICWTPAC
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