Fix the value of BEAM_LAST_ENCHANTMENT.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7416 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on November 7, 2008
42KM67VFQI4MGYFU52L6SHF7FPXOJLAO6T6MBVFVXEUXCFGWK5TAC
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