Refix confusion resistance checks to include plants and zombies. For the

latter I added a check vs. undead holiness, but that may be (probably is) too general.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4634 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on April 25, 2008
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