In the "%" screen, always display the shield class number. even when no

physical shield is equipped. This is so that, if the only shield available is magical, the player can see the shield class, just as in the HUD.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5857 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on June 15, 2008
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