In zin_retribution(), make the routine to skip over Zin's removal of

good mutations if the player isn't very mutated actually work, by using punishment properly in the switch statement.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3166 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on December 30, 2007
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