Fix spurious encumberance messages when combining ammo in inventory.

Fixes 2354891.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7823 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on December 13, 2008
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