Honour deviceinfo_disable_dhcpd flag in NetworkManager scripts

deviceinfo_disable_dhcpd only disables dhcpd during init, but it should
also be disabled in other contexts.

main/postmarketos-base-ui/rootfs-usr-lib-NetworkManager-dispatcher.d-50-tethering.sh

@@ -70,8 +70,13 @@ disable_tethering() {
 
 	# Restart unudhcpd and configure it similar to initfs
 	killall unudhcpd || true
-	(unudhcpd -i "$interface" -s "$host_ip" -c "$client_ip") &
-	logger -t nm-tethering "unudhcpd started"
+
+	if [ "$deviceinfo_disable_dhcpd" = "true" ]; then
+		logger -t nm-tethering "unudhcpd not started, deviceinfo_disable_dhcpd is true"
+	else
+		(unudhcpd -i "$interface" -s "$host_ip" -c "$client_ip") &
+		logger -t nm-tethering "unudhcpd started"
+	fi
 
 	# Reactivate gadget to apply changes
 	reactivate_gadget