kwalletmanager.desktop proper categories

[Nick Shaforostoff]

Hi. I'd like to make the following change.

Index: kwallet/kwalletmanager.desktop
===================================================================
--- kwallet/kwalletmanager.desktop      (revision 916199)
+++ kwallet/kwalletmanager.desktop      (working copy)
@@ -53,5 +53,5 @@
 Type=Application
 Terminal=false
 X-KDE-StartupNotify=false
-Categories=Qt;KDE;Settings;
+Categories=Qt;KDE;System;Security;
 X-DocPath=kwallet/index.html

This complies with
http://standards.freedesktop.org/menu-spec/menu-spec-1.0.html#category-registry

I believe KWallet is the system tool, not a setting one.
OK for me to commit?