For amphibious creatures with HT_WATER, don't force replacing floor compatible

terrain with deep water when placing them by map definition or in wizard mode. (Suggested in BR 2000631.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6168 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on June 27, 2008
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