Fix _do_high_level_summon() to take monster gods into account, too.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8953 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on February 7, 2009
6QIJGB3K64A3JK6S7FRHT4A64MNI2ENZPGWNZO6WOYYO3LFV43UAC
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