Apply white colouring for artefacts and lightgreen colouring for equipped

items to the inventory only. (But keep lightred colourng for cursed items everywhere.) This gives artefact wielded weapons their natural colour on the main screen and lets the Mace of Variability switch colours again, fixing 2381462.

For some reason, the line menu = inventory:white:.artefact. colours artefacts in pickup listings white.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7747 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dploog  on December 5, 2008
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