Change elemental type colour enum to use ETC_ prefix instead of EC_

prefix, which was conflicting with the Abyssal entry cause enum. Fixes [2605869].

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9110 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 17, 2009
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