If contaminate_player() makes the player glow when s/he wasn't glowing

before then give a "you are contaminated with residual magics" type message instead of "you feel more contaminated with magical energies".

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5916 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on June 17, 2008
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