"newly seen" vs "already seen" context was missing for see-monster activity

interrupt data.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2139 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on September 18, 2007
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