Modified monster halo slightly. I still don't like how it works with monster shadows, but there's really nothing that can be done with that right now.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4623 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on April 25, 2008
LM4CZJFWDPRAY6BHB75YBZIMROYZUX6RDIYZA3VDGFOJZGXQOXFQC
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