[libgnome-volume-control] Comment invalid <category> in DOAP file to pass git pre-receive hook

[Andre Klapper <aklapper src gnome org>]

commit ae1a34aafce7026b8c0f65a43c9192d756fe1057
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Dec 16 01:22:53 2018 +0100

    Comment invalid <category> in DOAP file to pass git pre-receive hook

 libgnome-volume-control.doap | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libgnome-volume-control.doap b/libgnome-volume-control.doap
index b87a90f..2fcc8e1 100644
--- a/libgnome-volume-control.doap
+++ b/libgnome-volume-control.doap
@@ -13,7 +13,7 @@
     as a submodule.
   </description>
 
-  <category rdf:resource="http://api.gnome.org/doap-extensions#desktop"; />
+  <!-- <category rdf:resource="http://api.gnome.org/doap-extensions#desktop"; /> -->
 
   <maintainer>
     <foaf:Person>