Fix an inverted use of parameters when calling

get_player_visible_monsters, and state "Not with a mimic in view" for known mimics rather than listing the object type since that seems a bit weird.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5137 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on May 19, 2008
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