scrsaver: Disable even when fullscreen comes quick
scrsaver: Disable even when fullscreen comes quick

As the screensaver might be disabled before we get access
to the D-Bus proxy, try again after we have the proxy.

Spotted by Chris Coulson.

https://bugzilla.gnome.org/show_bug.cgi?id=630711

mediaserver2-plugins/totem-mediaserver2,mediaserver2-plugins/totem-mediaserver2