webstaff: flat MARC editor now updates model on blur, not change
This fixes a problem where attempting to type in the flat
MARC editor would result in a fromBreaker()/toBreaker() cycle
being run with each keystroke, which (among other things) made
the user have to fight for control of the insertion cursor.
Signed-off-by: Galen Charlton <gmc@esilibrary.com> Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>