Ensure again that a weapon's curse status is always known after wielding

it, as, after r6787, it sometimes wouldn't if you knew the weapon's ego type (from e.g. being hit by the weapon if it was in a monster's hands before).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7062 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on September 29, 2008
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