Actually use MAX_WPN_ENCHANT instead of hardcoding +9 everywhere.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8022 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on December 29, 2008
E3D6MYCPSZJ64PQY4QLRJ2XCMKHHF3AOXM6I7JUEI5T2HMXCI7HQC
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