index display clean up bug

[Will Fiveash]

I've noticed running the latest dev version of mutt that if I use
Cntrl-G cancel when the "Purge 1 deleted message?" confirm message shows
up that message stays on the screen.  I'm running mutt Mutt 1.5.20
(2010-03-22) in a gnome-terminal with:
COLORTERM=gnome-terminal
TERM=rxvt
in the environment.
-- 
Will Fiveash