gluon-setup-mode: start urngd instead of haveged

OpenWRT 19.07 enables urngd by default, so haveged is redundant.

package/gluon-setup-mode/files/lib/gluon/setup-mode/rc.d/S13haveged

-#!/bin/sh /etc/rc.common
-
-if [ -x /etc/init.d/haveged ] && /etc/init.d/haveged enabled; then
-	. /etc/init.d/haveged
-fi

package/gluon-setup-mode/files/lib/gluon/setup-mode/rc.d/S13urngd

+#!/bin/sh /etc/rc.common
+
+if [ -x /etc/init.d/urngd ] && /etc/init.d/urngd enabled; then
+	. /etc/init.d/urngd
+fi