replace conf_{gap,color,font} with conf_screen since really we are

configuring the screen *after* parsing, just as we do a conf_client on
client manage.

screen.c

@@ -49,9 +49,7 @@ screen_init(int which)
 	xu_ewmh_net_supported(sc);
 	xu_ewmh_net_supported_wm_check(sc);
 
-	conf_gap(&Conf, sc);
-	conf_color(&Conf, sc);
-	conf_font(&Conf, sc);
+	conf_screen(sc);
 
 	screen_update_geometry(sc);