fff-layer3-config: add missing -q option for uci get

Suppresses the unhelpful "uci: Entry not found" message when running
configure-layer3 -c in case there is no `ip6addr` set on the client
interface.

Signed-off-by: Johannes Kimmel <fff@bareminimum.eu>
Reviewed-by: Fabian Bläse <fabian@blaese.de>
Reviewed-by: Robert Langhammer <rlanghammer@web.de>

src/packages/fff/fff-layer3-config/files/etc/layer3.d/30-network-client

@@ -20,7 +20,7 @@ configure() {
 
 	# ip6addr
 	#remove old ip6addr
-	for ip in $(uci get network.client.ip6addr); do
+	for ip in $(uci -q get network.client.ip6addr); do
 		if echo "$ip" | grep -v -e "fdff:" -e "fe80::1/64" > /dev/null; then
 			uci del_list network.client.ip6addr="$ip"
 		fi