Fix [2058165] by testing for non-moving monsters over water or lava

using mons_cannot_move() instead of monsters::paralysed().

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6904 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on September 11, 2008
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