Fix flight type handling so that spectral things can at least always

levitate again (since their class can), regardless of what actual type they are.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7169 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on October 6, 2008
456KTRCLDMONHJFPEKJYMXO737ZHKN36ZU3UQ77JDERXBU5VFMVQC
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