Fix Swap card not applying terrain effects, and not unsubmerging monsters.

Fixes [2502780].

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8873 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on February 1, 2009
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