Increase probability of non-decay-based skeleton drops from 25% to 33%.

This is the inverse of the chance of hide drops, and considering that corpse drops are required first and don't always occur, the actual probability is less.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8194 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 3, 2009
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