Changes the XFCE logout dialog default button focus from LogOut to Shutdown.

xfce4-session-default-button.patch

*** /tmp/xfce4-session-4.16.0/xfce4-session/xfsm-logout-dialog.c	2020-05-19 01:02:37.000000000 +0200
--- /home/filip/Builds/xfce4.16/xfce4-session/4.16.0/xfce4-session-4.16.0/xfce4-session/xfsm-logout-dialog.c	2020-12-30 20:32:45.000000000 +0100
***************
*** 235,253 ****
    /**
     * Logout
     **/
    button = xfsm_logout_dialog_button (_("_Log Out"), "xfsm-logout",
                                        "system-log-out", NULL,
                                        XFSM_SHUTDOWN_LOGOUT, dialog);
  
    gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
    gtk_widget_show (button);
-   gtk_widget_grab_focus (button);
  
    /**
     * Reboot
     **/
    if (!xfsm_shutdown_can_restart (dialog->shutdown, &can_restart, &error))
      {
        g_printerr ("%s: Querying CanRestart failed, %s\n\n",
                    PACKAGE_NAME, ERROR_MSG (error));
        g_clear_error (&error);
--- 235,252 ----
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*** 276,293 ****
--- 275,293 ----
      }
  
    button = xfsm_logout_dialog_button (_("Shut _Down"), "xfsm-shutdown",
                                        "system-shutdown", NULL,
                                        XFSM_SHUTDOWN_SHUTDOWN, dialog);
  
    gtk_box_pack_start (GTK_BOX (hbox), button, TRUE, TRUE, 0);
    gtk_widget_set_sensitive (button, can_shutdown);
    gtk_widget_show (button);
+   gtk_widget_grab_focus (button);
  
    /* new row for suspend/hibernate/hybrid sleep */
    hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, BORDER);
    gtk_box_set_homogeneous (GTK_BOX (hbox), TRUE);
    gtk_box_pack_start (GTK_BOX (button_vbox), hbox, FALSE, TRUE, 0);
  
    /**
     * Suspend
     *