[banshee] Remove unused file.

[Ruben Vermeersch <rubenv src gnome org>]

commit d777d958167a3faca2ccdf2bd37f1fc7a2d01b64
Author: Ruben Vermeersch <ruben savanne be>
Date:   Sat Mar 6 00:10:09 2010 +0100

    Remove unused file.
    
    Removes the unfinished and probably obsolete AccordionPane. Not included in the
    build anyway.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=611960

 .../Hyena.Gui/Hyena.Widgets/AccordionPane.cs       |   93 --------------------
 1 files changed, 0 insertions(+), 93 deletions(-)