Fix for the refusal-to-follow bug: monsters refused to visit disarmed trap squares.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@740 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on December 30, 2006
B3SINXBL7IW6267A4EKUWL5T2SZKIPJVC2DQR2DZMJRNYNW6LV3QC
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