Make TSO's abjuration protection properly increase with monster hit dice

instead of decrease (oops).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5788 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on June 13, 2008
U5BUJF7RAD3Z44WG5LE3NLVSFZALT5W6MHKQ3BSVAJ4NZ7PU7Q5QC
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