When trying to animate single undead, only count instances of remains

instead of all items, so that the "no remains/skeleton here" message is properly displayed when there are items on the floor but no remains.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9395 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on March 9, 2009
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