Allow monsters that can't swim or drown (e.g. the Royal Jelly) which

have been dumped into deep water (e.g. by the Water card) to move along the bottom in order to get out. Fixes [2519093].

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8985 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 8, 2009
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