Add one last consistency fix for equipment. Disallow elven hard helmets

(helmets and helms), as well as dwarven and orcish soft helmets (caps and wizards' hats). Those are the only kinds randomly generated, and some wanderers can get them.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3039 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on December 10, 2007
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