Fix _restore_level() mishandling non-Dungeon levels. This is hack;

improvements welcome. Fixes 2434656.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7856 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on December 17, 2008
2FJR4SP7LKN7XKKRBE2OXPAQTQDQCGJIU2CEYYMNTYB3I2WNHBLQC
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