[gnome-todo] desktop: drop 'Extra' category, it's doesn't exist

[Igor Gnatenko <ignatenko src gnome org>]

commit 8a37f68f046962d98c44a586ec3eed6dab43564d
Author: Igor Gnatenko <ignatenko gnome org>
Date:   Tue Jun 23 12:53:55 2015 +0300

    desktop: drop 'Extra' category, it's doesn't exist
    
    Signed-off-by: Igor Gnatenko <ignatenko gnome org>

 data/org.gnome.Todo.desktop.in.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/org.gnome.Todo.desktop.in.in b/data/org.gnome.Todo.desktop.in.in
index 9e43223..c58ac51 100644
--- a/data/org.gnome.Todo.desktop.in.in
+++ b/data/org.gnome.Todo.desktop.in.in
@@ -7,6 +7,6 @@ Terminal=false
 Type=Application
 StartupNotify=true
 OnlyShowIn=GNOME;
-Categories=GNOME;GTK;Utility;Extra;
+Categories=GNOME;GTK;Utility;
 _Keywords=Task;Productivity;
 DBusActivatable=true