Fix [2082964]: use player::can_see() to determine if the player can see

a monster, rather than all the checks for invisibility.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6881 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on September 6, 2008
3DPNUMSX7H22M5VMS6ZDCXKI2J3L62WN4NRORAOUYT33EW66KR5QC
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