Update d/p/ubuntu/dbus_request_shutdown.patch

Nathan Teodosiorequested to merge
nteodosio/gnome-session:request-reboot-shutdown into ubuntu/latest

The original implementation of the RequestReboot and RequestShutdown, introduced by this patch, were no longer working.

This fixes it by simply relaying the call to Reboot and Shutdown methods, instead of nearly duplicating them.

LP: #2100965

Test case:

Log into Gnome. Executing

dbus-send --print-reply --dest=org.gnome.SessionManager /org/gnome/SessionManager org.gnome.SessionManager.RequestReboot

and

dbus-send --print-reply --dest=org.gnome.SessionManager /org/gnome/SessionManager org.gnome.SessionManager.RequestShutdown

should work as expected.

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