Player's magic can be 0 without the player dying (at least immediately) so remove that check. This allows the LOW MAGIC WARNING to appear if the player's magic drops from above the warning to 0 in one go.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@989 c06c8d41-db1a-0410-9941-cceddc491573

Created by  mtitus_613  on March 6, 2007
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