Description of problem:
The user-dirs-update-gtk.desktop fails to open when starting a KDE session. As 
far as I know, this will be changed via a patch, allowing KDE to look in 
$XDG_CONFIG_DIRS/autostart (/etc/xdg/autostart). I've made some minor changes 
to user-dirs-update-gtk.desktop to allow it to start successfully under a KDE 
session.

How reproducible:
Always.

Steps to Reproduce:
1.Start a KDE session
  
Actual results:
Note that the foo.desktop files placed in /etc/xdg/autostart aren't seen when 
KDE starts and the apps they reference are not started. Moving them to a 
location where they are seen by a KDE session results in undesirable behavior.

Expected results:
The desktop files in the system-wide autostart directory should start without 
major issues.

Additional info:
The attached patch adds:

StartupNotify=false
X-KDE-autostart-after=panel

StartupNotify allows the applet to start under a KDE session without 
displaying KDE's app start up notification icon.

X-KDE-autostart-after=panel allows the applet to start after KDE's panel 
(kicker), preventing a race between the panel and the applet.