monsters into shapeshifters consistently with other polymorphs of that nature.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7939 c06c8d41-db1a-0410-9941-cceddc491573
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monster_polymorph(def, RANDOM_MONSTER, PPT_MORE, true);
monster_polymorph(def, RANDOM_MONSTER, PPT_MORE);