Changed white to green in overmap headers (David.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@822 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on January 10, 2007
6Q6XJAVYHX7SZN4IQYV6U5XZ5ESVD6S33QHMNNYBMEEGBJ6WA7QAC
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