Fix zombified monsters' speed downgrades: monsters::number no longer

holds the zombie base type, so properly use mons_zombie_base() instead.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9342 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on March 5, 2009
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