Merge remote-tracking branch 'origin/pr/222'

* origin/pr/222:
  disable qubes-icon-sender on sys-net and sys-usb Qubes icon sender allows to update applications windows icons. In practice, few windows are opened on the sys-vms. Disabling this service allows to recover some RAM without causing inconvenience

Pull request description:

Qubes icon sender allows to update applications windows icons. In practice, few windows are opened on the sys-vms. Disabling this service allows to recover some RAM without causing inconvenience.

window-icon-updater/qubes-icon-sender.desktop

@@ -8,3 +8,4 @@ Type=Application
 Categories=
 GenericName=
 OnlyShowIn=X-QUBES;
+AutostartCondition=unless-exists /var/run/qubes-service/minimal-netvm;unless-exists /var/run/qubes-service/minimal-usbvm