Tweak vampires' being given Unarmed Combat skill when they lack it to be

like that of spellcasters' being given Spellcasting skill when they lack it. They now get two levels of Unarmed Combat unmodified by their above-average aptitude, i.e. level 2 at 0% instead of level 2 at 15%.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8719 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 24, 2009
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