firewall: Remove src_port from firewall.config to receive dhcpv6 replies

Seems like my second try was again whitespace broken. Sorry for the noise.

Remove src_port from firewall.config to receive dhcpv6 replies. Fixes #20295.

Signed-off-by: Anselm Eberhardt <a.eberhardt@cygnusnetworks.de>

SVN-Revision: 46842

package/network/config/firewall/files/firewall.config

@@ -60,7 +60,6 @@ config rule
 	option src		wan
 	option proto		udp
 	option src_ip		fe80::/10
-	option src_port		547
 	option dest_ip		fe80::/10
 	option dest_port	546
 	option family		ipv6