Fixing corpse tile for big kobolds. Additionally, monsters that can generate a corpse (even if it wouldn't happen during normal play) now have a reasonable tile assigned to them.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4953 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on May 9, 2008
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