Use the same type for shield_blocks on both the player and monster

sides.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8524 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on January 17, 2009
BYAU2Q2Y3YARSDGBJPJUZWUYVETAHO6PSJ6P4XCWPGYRRZMDWEQAC
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