Attempt to fix [2488357] by fixing the default uninitialized beam range.

It was being set to -2, but the code was checking for -1.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8274 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 6, 2009
P4O6NEHLF6H3SQPGA2PER6N7S7HLL7QXV66253Z2Z2KJBTPQ75JQC
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