When blessing a weapon, call burden_change(), in case the weapon's

weight changes, or its becoming an artefact affects the player's strength.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4269 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on April 16, 2008
HARI55JRNKZRYK5DZ4J3627XVWSBZTOUPPJHD6LUXCZRANFAKD6QC
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