Fixes a typo in rockbox.desktop

Change-Id: Ibae1b391205e5372a506dc8f3820a53f7012252c
Reviewed-on: http://gerrit.rockbox.org/378
Reviewed-by: Jonathan Gordon <rockbox@jdgordon.info>
diff --git a/packaging/rockbox.desktop b/packaging/rockbox.desktop
index bc6cc85..a935b82 100644
--- a/packaging/rockbox.desktop
+++ b/packaging/rockbox.desktop
@@ -1,7 +1,7 @@
 [Desktop Entry]
 Name=Rockbox
 GenericName=Music Player
-X-GNOME-FullName=Rocbox Music Player
+X-GNOME-FullName=Rockbox Music Player
 Comment=The Rockbox Custom Jukebox Firmware on your Desktop
 Exec=rockbox
 Icon=rockbox