Change MONUSE_OPEN_DOOR -> MONUSE_NOTHING for a number of monsters,

including dragons and other animal-like monsters. (Fixes 1992865)

I think it's okay that golems are stupid but able to open doors. And while I was at it I made the orb guardians smarter (I_PLANT -> I_NORMAL) because, really, what kind of guardians are they if they're so stupid?

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5778 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on June 13, 2008
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