Since you.turn_is_over is now always true once world_reacts() starts

processing, simplify the religion_turn_over() pre-condition assertion.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8686 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 22, 2009
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