Let's see if this works a bit better... only update monster display

when not delaying. Seems a bit faster, but I've seen cases where there's a monster on screen but not in the list (maybe before this change too; not sure)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3855 c06c8d41-db1a-0410-9941-cceddc491573

Created by  pauldubois  on March 24, 2008
FACD4S74A4PYPEYDEIDP56BPE5NJGRK2RWVOKROXLMT7FJUPTYQAC
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