Fixing minimap issue where the markers could get confused if there were multiple squares with the player colour. Markers no longer depend on the contents of the map.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4409 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on April 20, 2008
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