When creating the first dungeon level after starting in the Abyss, mark

it as existing, so that it's properly saved when going to the second dungeon level.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6277 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on June 30, 2008
S4RG6BEPNGMZELQ3HDRLX6XI5Y4FYLZME5FVO76WNRN4J52IAZRQC
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