[sushi] audio: fix missing import

[Cosimo Cecchi <cosimoc src gnome org>]

commit 1c0977f28177109e738ff81a4ac4dcc99c064c76
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Sat Nov 14 11:36:10 2015 -0800

    audio: fix missing import
    
    This was causing album art not to display.

 src/js/viewers/audio.js |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/js/viewers/audio.js b/src/js/viewers/audio.js
index cf336a4..f885d5d 100644
--- a/src/js/viewers/audio.js
+++ b/src/js/viewers/audio.js
@@ -23,6 +23,7 @@
  *
  */
 
+const GdkPixbuf = imports.gi.GdkPixbuf;
 const Gio = imports.gi.Gio;
 const Gst = imports.gi.Gst;
 const Gtk = imports.gi.Gtk;