Let the Helix card remove a random bad mutation, instead of hardcoding a

list of bad mutations.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4813 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on May 2, 2008
PX2762PTDRWSIZ6RUWHD4NXYM2K7A7YEMVPMPOFEN2X3FXCXLZ5AC
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