In mons_flies(), determine flight status for zombies based on their

original class, so that e.g. giant bat zombies still fly and giant eyeball zombies still levitate.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3233 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 9, 2008
RGE3P266JGL6TUMCAMIJB3AIVU5GSQGIH43ZITKXF5WCCXLHKKVQC
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