Remove manual user logout

This is not needed because the kill command handles everything.

tests/applications/gnome-initial-setup/aaa_setup.pm

@@ -10,13 +10,6 @@ sub run {
     my $self = shift;
     my $username = get_var("USER_LOGIN") // "test";
 
-    # Logout from the Gnome session to end up all user activites.
-    send_key("super");
-    wait_still_screen(3);
-    send_key("ctrl-alt-delete");
-    assert_and_click("log_out_confirm");
-    assert_screen("graphical_login");
-
     # Switch to root console
     $self->root_console(tty => 3);