Clearing trapping nets moved into player::moveto() and level change.

This fixes some bugs (e.g. Portal spell and nets interact properly.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9036 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 12, 2009
UP6TD25TZ3ENYTOB6N6NA325ROEJPDCW5VPNBRTAFMC7HLFXU4CQC
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